diff --git a/matrix_sdk_crypto/benches/crypto_bench.rs b/matrix_sdk_crypto/benches/crypto_bench.rs
index 8537d3b0..6467bb65 100644
--- a/matrix_sdk_crypto/benches/crypto_bench.rs
+++ b/matrix_sdk_crypto/benches/crypto_bench.rs
@@ -40,6 +40,13 @@ fn keys_claim_response() -> claim_keys::Response {
     claim_keys::Response::try_from(data).expect("Can't parse the keys upload response")
 }
 
+fn huge_keys_query_resopnse() -> get_keys::Response {
+    let data = include_bytes!("./keys_query_2000_members.json");
+    let data: Value = serde_json::from_slice(data).unwrap();
+    let data = response_from_file(&data);
+    get_keys::Response::try_from(data).expect("Can't parse the keys query response")
+}
+
 pub fn keys_query(c: &mut Criterion) {
     let runtime = Builder::new_multi_thread()
         .build()
@@ -258,6 +265,58 @@ pub fn room_key_sharing(c: &mut Criterion) {
     group.finish()
 }
 
+pub fn devices_missing_sessions_collecting(c: &mut Criterion) {
+    let runtime = Builder::new_multi_thread()
+        .build()
+        .expect("Can't create runtime");
+
+    let machine = OlmMachine::new(&alice_id(), &alice_device_id());
+    let response = huge_keys_query_resopnse();
+    let uuid = Uuid::new_v4();
+    let users: Vec<UserId> = response.device_keys.keys().cloned().collect();
+
+    let count = response
+        .device_keys
+        .values()
+        .fold(0, |acc, d| acc + d.len());
+
+    let mut group = c.benchmark_group("Devices missing sessions collecting");
+    group.throughput(Throughput::Elements(count as u64));
+
+    let name = format!("{} devices", count);
+
+    runtime
+        .block_on(machine.mark_request_as_sent(&uuid, &response))
+        .unwrap();
+
+    group.bench_function(BenchmarkId::new("memory store", &name), |b| {
+        b.to_async(&runtime).iter_with_large_drop(|| async {
+            machine.get_missing_sessions(users.iter()).await.unwrap()
+        })
+    });
+
+    let dir = tempfile::tempdir().unwrap();
+    let machine = runtime
+        .block_on(OlmMachine::new_with_default_store(
+            &alice_id(),
+            &alice_device_id(),
+            dir.path(),
+            None,
+        ))
+        .unwrap();
+
+    runtime
+        .block_on(machine.mark_request_as_sent(&uuid, &response))
+        .unwrap();
+
+    group.bench_function(BenchmarkId::new("sled store", &name), |b| {
+        b.to_async(&runtime)
+            .iter(|| async { machine.get_missing_sessions(users.iter()).await.unwrap() })
+    });
+
+    group.finish()
+}
+
 fn criterion() -> Criterion {
     #[cfg(target_os = "linux")]
     let criterion = Criterion::default().with_profiler(perf::FlamegraphProfiler::new(100));
@@ -270,6 +329,6 @@ fn criterion() -> Criterion {
 criterion_group! {
     name = benches;
     config = criterion();
-    targets = keys_query, keys_claiming, room_key_sharing
+    targets = keys_query, keys_claiming, room_key_sharing, devices_missing_sessions_collecting,
 }
 criterion_main!(benches);
diff --git a/matrix_sdk_crypto/benches/keys_query_2000_members.json b/matrix_sdk_crypto/benches/keys_query_2000_members.json
new file mode 100644
index 00000000..6eda9185
--- /dev/null
+++ b/matrix_sdk_crypto/benches/keys_query_2000_members.json
@@ -0,0 +1,40069 @@
+{
+  "device_keys": {
+    "@alice:hs1": {
+      "ALDJLSKJD": {
+        "algorithms": [
+          "m.olm.v1.curve25519-aes-sha2",
+          "m.megolm.v1.aes-sha2"
+        ],
+        "device_id": "ALDJLSKJD",
+        "keys": {
+          "curve25519:ALDJLSKJD": "Bvk2zCI2YihAiuiZBPoPYkS3+s8ZwqNVll4qKnI9TWw",
+          "ed25519:ALDJLSKJD": "FrhkI5JUJmEWs6Io+U5S49SoSGw9nD47ubMD6VYEbYs"
+        },
+        "signatures": {
+          "@alice:hs1": {
+            "ed25519:ALDJLSKJD": "HFk9kfScxqUJaCQj39V38a491LCMPaVIyn/IKLKu8OWNWflzMqX70kOiN8VaYDhByv/Gbewnpw/RTm/RsB2SCg"
+          }
+        },
+        "user_id": "@alice:hs1",
+        "unsigned": {}
+      },
+      "UWWSVUZVWH": {
+        "algorithms": [
+          "m.olm.v1.curve25519-aes-sha2",
+          "m.megolm.v1.aes-sha2"
+        ],
+        "device_id": "UWWSVUZVWH",
+        "keys": {
+          "curve25519:UWWSVUZVWH": "6osBROgsCSQxajzsqPA9ynYCVdAEaiOVB6wNgPl7RXE",
+          "ed25519:UWWSVUZVWH": "cQ6bUAT64/5xi+Ux7ixKfDEBgtO0v/LnqjOqTuowsfA"
+        },
+        "signatures": {
+          "@alice:hs1": {
+            "ed25519:UWWSVUZVWH": "+snfEYv9xwFnL5iroIeLVgFhjafHiBgYwwQKGORFqJRqXLdqOiwJ/ckgVZjMD3ZAmUVpbUOHnvI0LCJk2HBBBA"
+          }
+        },
+        "user_id": "@alice:hs1",
+        "unsigned": {
+          "device_display_name": "Weechat-Matrix-rs"
+        }
+      },
+      "XQWLNMCYQZ": {
+        "algorithms": [
+          "m.olm.v1.curve25519-aes-sha2",
+          "m.megolm.v1.aes-sha2"
+        ],
+        "device_id": "XQWLNMCYQZ",
+        "keys": {
+          "curve25519:XQWLNMCYQZ": "eIjT2EDiNARdfAh1/4/pRHhYioUvq+zmR5rVBWGk33E",
+          "ed25519:XQWLNMCYQZ": "RHoVaLGhwPeda91cwyDmwcE9ezaqdX8CVDYaH+cnFoU"
+        },
+        "signatures": {
+          "@alice:hs1": {
+            "ed25519:XQWLNMCYQZ": "8EjiyhPHfzfRpX/yTUpc6YGfhIttjL5X/1qE2iduwnrkciLKMz17cSfb9WbgHdknQIDjj88XYYyfNaPxfjV1DA"
+          }
+        },
+        "user_id": "@alice:hs1",
+        "unsigned": {
+          "device_display_name": "Weechat-Matrix-rs"
+        }
+      }
+    },
+    "@alice_1003:hs1": {
+      "ALICEDEVICE1003": {
+        "algorithms": [
+          "m.olm.v1.curve25519-aes-sha2",
+          "m.megolm.v1.aes-sha2"
+        ],
+        "device_id": "ALICEDEVICE1003",
+        "keys": {
+          "curve25519:ALICEDEVICE1003": "jmCyAwzZae3xip/iIOWtUwp73b8vQ3aXrAcAowcoPkY",
+          "ed25519:ALICEDEVICE1003": "eLv6cTJMGVuZlRNnxMJft0KvSaL6nKJW4ETn6ZraL2I"
+        },
+        "signatures": {
+          "@alice_1003:hs1": {
+            "ed25519:ALICEDEVICE1003": "F+AULxqesJTkxcgdWnCKalIFKla2ohnufpSDVYYbjbCb0IoGKMUG/weRFQZxiMVI4G9a7EL2+uLTcpJd7rlBCg"
+          }
+        },
+        "user_id": "@alice_1003:hs1",
+        "unsigned": {}
+      }
+    },
+    "@alice_1907:hs1": {
+      "ALICEDEVICE1907": {
+        "algorithms": [
+          "m.olm.v1.curve25519-aes-sha2",
+          "m.megolm.v1.aes-sha2"
+        ],
+        "device_id": "ALICEDEVICE1907",
+        "keys": {
+          "curve25519:ALICEDEVICE1907": "t/+KwdftUYRmeppPGj9gYizjVgcujGTqiBPD7rn5EHk",
+          "ed25519:ALICEDEVICE1907": "487OSTxB7+h4xQPbhVsE/8RWvqznORcIX2Z44W0rSMY"
+        },
+        "signatures": {
+          "@alice_1907:hs1": {
+            "ed25519:ALICEDEVICE1907": "Efb8hwsiggUX5hcN8MRmPwx/p4uJAfGFsQGLs5DAPXm51uN/sYg3qjQNpDYrBik+akR6m2pAJzlrOuHIC0bOAw"
+          }
+        },
+        "user_id": "@alice_1907:hs1",
+        "unsigned": {}
+      }
+    },
+    "@alice_1993:hs1": {
+      "ALICEDEVICE1993": {
+        "algorithms": [
+          "m.olm.v1.curve25519-aes-sha2",
+          "m.megolm.v1.aes-sha2"
+        ],
+        "device_id": "ALICEDEVICE1993",
+        "keys": {
+          "curve25519:ALICEDEVICE1993": "L38mXeoMt4cD1vmVpQTCuynd2ymcdMd0HsQ80DeGtxI",
+          "ed25519:ALICEDEVICE1993": "wTiEjRWUfvdyoUAt0sH9q3FHY0mjfNdNeTu8Ft73+ko"
+        },
+        "signatures": {
+          "@alice_1993:hs1": {
+            "ed25519:ALICEDEVICE1993": "uIZx1u8lH3KHdrh9zS24VFlJOrgoNe8pvrWifq/0C0GAD337vOEmFiDpOnqiyEIrHKlFgDL/fvMt4OCSPMY/AQ"
+          }
+        },
+        "user_id": "@alice_1993:hs1",
+        "unsigned": {}
+      }
+    },
+    "@alice_1994:hs1": {
+      "ALICEDEVICE1994": {
+        "algorithms": [
+          "m.olm.v1.curve25519-aes-sha2",
+          "m.megolm.v1.aes-sha2"
+        ],
+        "device_id": "ALICEDEVICE1994",
+        "keys": {
+          "curve25519:ALICEDEVICE1994": "l4HAN38VdY/2KJrm5Z4wHuoCaXm0oLq2HuZ1YZjtt3k",
+          "ed25519:ALICEDEVICE1994": "LD3SwzaBmmoHt0myb9nwUAesorrL1MVWu8wEPL6uooE"
+        },
+        "signatures": {
+          "@alice_1994:hs1": {
+            "ed25519:ALICEDEVICE1994": "bY/C/J1q9EaW32u1xo6rGdvi63AjHLL22ZobO/wb8KhRALmg4LL1o0nX6QeJgY9k4rAEjjTF0qGwBwukZ7ITCw"
+          }
+        },
+        "user_id": "@alice_1994:hs1",
+        "unsigned": {}
+      }
+    },
+    "@alice_1995:hs1": {
+      "ALICEDEVICE1995": {
+        "algorithms": [
+          "m.olm.v1.curve25519-aes-sha2",
+          "m.megolm.v1.aes-sha2"
+        ],
+        "device_id": "ALICEDEVICE1995",
+        "keys": {
+          "curve25519:ALICEDEVICE1995": "5OpKhFWuPPz/3YAF9Z7VDsCAN/tsWmWbEVsj/OaA30w",
+          "ed25519:ALICEDEVICE1995": "97N4brNlusgbKHqEgNt0sn8GOmPymWt9n5X8Mi5UJ4A"
+        },
+        "signatures": {
+          "@alice_1995:hs1": {
+            "ed25519:ALICEDEVICE1995": "2hZnxH0eYTLvNfGCqcd5V4XJA+QdFKhIEDI+/zvcv4iptLUqlyfvC5pWElhkBh0miF/RfuyGtS7hjeSPDLiiCA"
+          }
+        },
+        "user_id": "@alice_1995:hs1",
+        "unsigned": {}
+      }
+    },
+    "@alice_1996:hs1": {
+      "ALICEDEVICE1996": {
+        "algorithms": [
+          "m.olm.v1.curve25519-aes-sha2",
+          "m.megolm.v1.aes-sha2"
+        ],
+        "device_id": "ALICEDEVICE1996",
+        "keys": {
+          "curve25519:ALICEDEVICE1996": "nAIXPRfcs6UdnVkp8Svr3YSxE59G7fYlxT221GayiXI",
+          "ed25519:ALICEDEVICE1996": "gXVKZJf5omUPep3LUljuSq9HJOtEjsqOOqUvDzgHzW8"
+        },
+        "signatures": {
+          "@alice_1996:hs1": {
+            "ed25519:ALICEDEVICE1996": "uJxPXZywJ+sB7zbH4QvS8QMxLsqpQLGjlxZFjLldXnE8R5sOQrX4wcp+1YBBgzz6ve2ZIObIKCYVyGLwH19TBw"
+          }
+        },
+        "user_id": "@alice_1996:hs1",
+        "unsigned": {}
+      }
+    },
+    "@alice_1997:hs1": {
+      "ALICEDEVICE1997": {
+        "algorithms": [
+          "m.olm.v1.curve25519-aes-sha2",
+          "m.megolm.v1.aes-sha2"
+        ],
+        "device_id": "ALICEDEVICE1997",
+        "keys": {
+          "curve25519:ALICEDEVICE1997": "T2+2b/cjsSjsSDLfzAS9dLkzKTkxvSC5rMpIFOv0P3c",
+          "ed25519:ALICEDEVICE1997": "Sm/NFId3no+9uWh5jIddYHGBnMQRgdKfkxVtxXBMbGk"
+        },
+        "signatures": {
+          "@alice_1997:hs1": {
+            "ed25519:ALICEDEVICE1997": "WjDNlTcCJGyNaCw+X690KIKyhLF4xGkJI0kTMhbjmfDqLFRcFruoac03I3BkQ2Bb57sX8SuXrnVytSjpAQYOBw"
+          }
+        },
+        "user_id": "@alice_1997:hs1",
+        "unsigned": {}
+      }
+    },
+    "@alice_1998:hs1": {
+      "ALICEDEVICE1998": {
+        "algorithms": [
+          "m.olm.v1.curve25519-aes-sha2",
+          "m.megolm.v1.aes-sha2"
+        ],
+        "device_id": "ALICEDEVICE1998",
+        "keys": {
+          "curve25519:ALICEDEVICE1998": "qUBcL039rXtZhrejR3BjGMHxgM314HtZMKRKQseipUw",
+          "ed25519:ALICEDEVICE1998": "4fZ6kuswUTWW3Lyu+LLEKBfHvD4g/vyZE/IJ6aAv2mc"
+        },
+        "signatures": {
+          "@alice_1998:hs1": {
+            "ed25519:ALICEDEVICE1998": "JDb5cp+Ms1B/oNoVjXfXk0F9WIgnhLLwX1YB8UdLTnAe7ufp49s+aIBY5ozFHk5mhhyNyIz13FLFELUvkaV0AA"
+          }
+        },
+        "user_id": "@alice_1998:hs1",
+        "unsigned": {}
+      }
+    },
+    "@alice_1999:hs1": {
+      "ALICEDEVICE1999": {
+        "algorithms": [
+          "m.olm.v1.curve25519-aes-sha2",
+          "m.megolm.v1.aes-sha2"
+        ],
+        "device_id": "ALICEDEVICE1999",
+        "keys": {
+          "curve25519:ALICEDEVICE1999": "GQWm9Vc2F52V8jWIGPzaK7zuNmn0zFUt0CtXcA/hhSI",
+          "ed25519:ALICEDEVICE1999": "kfp+7X8qjftcdX1RDXVefgxe4rlKlszgjrBpHZXXX9E"
+        },
+        "signatures": {
+          "@alice_1999:hs1": {
+            "ed25519:ALICEDEVICE1999": "EgrVPIF4H9yW0mJfjel73anAnTZXO+sFXnbmhE0N8qupPyi13O/hrACQrjlI5H36XMOEuylCkg70biPIaai4AA"
+          }
+        },
+        "user_id": "@alice_1999:hs1",
+        "unsigned": {}
+      }
+    },
+    "@alice_382:hs1": {
+      "ALICEDEVICE382": {
+        "algorithms": [
+          "m.olm.v1.curve25519-aes-sha2",
+          "m.megolm.v1.aes-sha2"
+        ],
+        "device_id": "ALICEDEVICE382",
+        "keys": {
+          "curve25519:ALICEDEVICE382": "dQezXXFmJAi5khWAgCRITfgXOKAI5eruSRuzB2+LwBY",
+          "ed25519:ALICEDEVICE382": "nuJIfUTdsRW/eNBtINVvCyJzns3LMehnPtCPpA0pBTw"
+        },
+        "signatures": {
+          "@alice_382:hs1": {
+            "ed25519:ALICEDEVICE382": "hmZ+uT0acfs0RLh6NXUm/q/W09oF1I2keAmJprtMKw2TS6LigXMYqzqBD0hhRKGfod9GAKeTxC1fucF/u/PICw"
+          }
+        },
+        "user_id": "@alice_382:hs1",
+        "unsigned": {}
+      }
+    },
+    "@alice_401:hs1": {
+      "ALICEDEVICE401": {
+        "algorithms": [
+          "m.olm.v1.curve25519-aes-sha2",
+          "m.megolm.v1.aes-sha2"
+        ],
+        "device_id": "ALICEDEVICE401",
+        "keys": {
+          "curve25519:ALICEDEVICE401": "cwnvvGjjW4kq7ozfUL4cZutmUjy0gCMdJuX4UsRkfyA",
+          "ed25519:ALICEDEVICE401": "p5c7iPklvR0QLevwDHdwJtl5pYRsGid/v0Qumer/uGI"
+        },
+        "signatures": {
+          "@alice_401:hs1": {
+            "ed25519:ALICEDEVICE401": "WSCn8IG0gTbaEADYxj6rTCO/SpZnjluPzyRuc5JM/MH1JnzJJmuaUSdONn0MQzuYdcA417l4yXMHGpFZfS1oDw"
+          }
+        },
+        "user_id": "@alice_401:hs1",
+        "unsigned": {}
+      }
+    },
+    "@alice_53:hs1": {
+      "ALICEDEVICE53": {
+        "algorithms": [
+          "m.olm.v1.curve25519-aes-sha2",
+          "m.megolm.v1.aes-sha2"
+        ],
+        "device_id": "ALICEDEVICE53",
+        "keys": {
+          "curve25519:ALICEDEVICE53": "5JqB4M0aVJPeB8wAw4a5IK1QLhR9tSaquhgyQny4LFg",
+          "ed25519:ALICEDEVICE53": "1MTqtrjiEhw83r7FO77g7eRKtHcnV7KaQhh7JqMUdHM"
+        },
+        "signatures": {
+          "@alice_53:hs1": {
+            "ed25519:ALICEDEVICE53": "0LIWO1qT+GjBcxEAimVbs3FgSkOd8ewfViue6th31Gum39D8ThiVYprgI1zKbkQPbvYIVsm79ZKPCv30erxUDg"
+          }
+        },
+        "user_id": "@alice_53:hs1",
+        "unsigned": {}
+      }
+    },
+    "@alice_1000:hs1": {
+      "ALICEDEVICE1000": {
+        "algorithms": [
+          "m.olm.v1.curve25519-aes-sha2",
+          "m.megolm.v1.aes-sha2"
+        ],
+        "device_id": "ALICEDEVICE1000",
+        "keys": {
+          "curve25519:ALICEDEVICE1000": "Wnc3hFKK2HHviQD7ylyAiCzU1sgVftBcQEfPRvLsPzU",
+          "ed25519:ALICEDEVICE1000": "Iz8ecmIVjDpyZyAfZyUrm7NTXFv7ZMB/9tDH39yFAqQ"
+        },
+        "signatures": {
+          "@alice_1000:hs1": {
+            "ed25519:ALICEDEVICE1000": "cLyv2ovqmYSns1soNAXw9d20w50avWejrg3AdkGMuDuWoH1lKZk5UpKa47yJAVgvjlqonmIgoKb0UavXnTWXCA"
+          }
+        },
+        "user_id": "@alice_1000:hs1",
+        "unsigned": {}
+      }
+    },
+    "@alice_1014:hs1": {
+      "ALICEDEVICE1014": {
+        "algorithms": [
+          "m.olm.v1.curve25519-aes-sha2",
+          "m.megolm.v1.aes-sha2"
+        ],
+        "device_id": "ALICEDEVICE1014",
+        "keys": {
+          "curve25519:ALICEDEVICE1014": "tZgqLkmDd48ruyjsyHjlbfiPE1DAq1Etd2am4MQqvzk",
+          "ed25519:ALICEDEVICE1014": "apJmccZk/luI2ONWSIDJhKwHjO0sfZrfhzJbhnnI8q8"
+        },
+        "signatures": {
+          "@alice_1014:hs1": {
+            "ed25519:ALICEDEVICE1014": "Kyn1mRRaVQESX+nyJfFKttthKhR1fUC6hd6/u8CtoLu5MVMdWTNolypqN8ruprBDLGvZABKwjIYQohmVZsB2Cg"
+          }
+        },
+        "user_id": "@alice_1014:hs1",
+        "unsigned": {}
+      }
+    },
+    "@alice_1015:hs1": {
+      "ALICEDEVICE1015": {
+        "algorithms": [
+          "m.olm.v1.curve25519-aes-sha2",
+          "m.megolm.v1.aes-sha2"
+        ],
+        "device_id": "ALICEDEVICE1015",
+        "keys": {
+          "curve25519:ALICEDEVICE1015": "jmoNh4Og0vXnPc5T3ag3tpBiIEMEOTvJs1agebXW2xY",
+          "ed25519:ALICEDEVICE1015": "8z6xmS3ryuLyWsN8dIvc4AgOINr/9fgknZcmglzr3ic"
+        },
+        "signatures": {
+          "@alice_1015:hs1": {
+            "ed25519:ALICEDEVICE1015": "uV+6NLhTv1FSw8e/YWNmgsSsvHyf2JUgI2ZuR8hkgXxfuydHLMDM/xxqLrD1fQAblcPq0RxnUAxrKL8MOxneCQ"
+          }
+        },
+        "user_id": "@alice_1015:hs1",
+        "unsigned": {}
+      }
+    },
+    "@alice_1018:hs1": {
+      "ALICEDEVICE1018": {
+        "algorithms": [
+          "m.olm.v1.curve25519-aes-sha2",
+          "m.megolm.v1.aes-sha2"
+        ],
+        "device_id": "ALICEDEVICE1018",
+        "keys": {
+          "curve25519:ALICEDEVICE1018": "HJZoCGGADDuJemzu1tiYg1hMeYuCVgSMlkjLLP0wC3E",
+          "ed25519:ALICEDEVICE1018": "MwwwUwT2ZXbnSrukk0C8GGCsFWFPj0P5OvGf6JlCBKc"
+        },
+        "signatures": {
+          "@alice_1018:hs1": {
+            "ed25519:ALICEDEVICE1018": "Fm95CC9mAK/VkOtpLp142nSKNb+DkhuGmKqot6Dqoel6YapFLTpHU7stShm3b0TduzPLcabvxVEJ2rjZf1hzBQ"
+          }
+        },
+        "user_id": "@alice_1018:hs1",
+        "unsigned": {}
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