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Minor improvements to filtering performance #5054
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This is a step towards the room list not having to concern itself with the search parameters.
This prevents the entire left panel from having to re-mount whenever the search query changes.
It's a bit more complicated this way, but helps reduce some of the latency involved in remounting the entire room list.
It slows things down a bit, and in practice is more unlikely to be a problem than a savior.
This is just maintenance noticed while debugging.
This could in theory cause double rendering of the room list under some conditions.
This reduces the update cost of rooms changing, and fixes a bug where when a sublist became filtered it would change the notification count of the sublist. This does change the expected usage of the state store to ensuring that only one place updates the rooms on the list states, which is currently the room list store. Ideally the state store could listen to the room list store to update itself, however due to a complicated require() loop it is not possible.
t3chguy
approved these changes
Jul 28, 2020
Co-authored-by: Michael Telatynski <7t3chguy@gmail.com>
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For element-hq/element-web#14750
These changes are likely best reviewed commit-by-commit.
Collectively these do not improve the situation too well: on a test account they have reduced times for 2.0 seconds to 1.4 seconds per key. We do have some throttle logic in place in these changes, however in this account's case it does not help as the task overall takes longer than the keypress handling.
There is not much more we can do to improve this situation. We can't lazily load room tiles, can't render them elsewhere to put them into the DOM, and can't do much about how tooltips work. If we could somehow do one of these three, it could increase performance by 1-5x. For now though, this is likely going to have to be fine.