performance evaluation

automerge performance test

- initial items:
    - 3 items, 1 change:
 LOG  2022-06-24T00:33:36.325Z got new data from websocket!
 LOG  2022-06-24T00:33:36.325Z parsed meta: setDocs
 LOG  2022-06-24T00:33:36.337Z case: setDocs
 LOG  2022-06-24T00:33:36.338Z MERGE START.
 LOG  2022-06-24T00:33:36.338Z merge function start now
 LOG  2022-06-24T00:33:36.371Z merge function finished
 LOG  2022-06-24T00:33:36.440Z MERGE END.
    - result: 33ms for 1 change

- add 7 items, toggle all of them:
    - result: 150ms for 18 changes.

- toggle items done and not done:
    - result: 250ms for 58 changes.
    - result: 380ms for 128 changes.
    - result: 650ms for 228 changes.
    - result: 1s for 567 changes.
    - result: 3.1s for 1675 changes.

- toggle items done and not done:
 LOG  2022-06-24T01:04:57.398Z got new data from websocket!
 LOG  2022-06-24T01:04:57.399Z parsed meta: setDocs
 LOG  2022-06-24T01:04:57.502Z case: setDocs
 LOG  2022-06-24T01:04:57.502Z MERGE START.
 LOG  2022-06-24T01:04:57.502Z merge function start now
 LOG  2022-06-24T01:04:58.585Z merge function finished
 LOG  2022-06-24T01:04:58.651Z MERGE END.
 LOG  2022-06-24T01:05:31.175Z 567
    - result: 1s for 567 changes

- toggle items done and not done:
 LOG  2022-06-24T01:23:25.357Z got new data from websocket!
 LOG  2022-06-24T01:23:25.357Z parsed meta: setDocs
 LOG  2022-06-24T01:23:25.567Z case: setDocs
 LOG  2022-06-24T01:23:25.568Z MERGE START.
 LOG  2022-06-24T01:23:25.568Z merge function start now
 LOG  2022-06-24T01:23:28.631Z merge function finished
 LOG  2022-06-24T01:23:28.714Z MERGE END.
 LOG  2022-06-24T01:23:32.528Z 1675
    - result: 3.1s for 1675 changes