fix(@desktop/chat): abnormal CPU usage and slowness

[saledjenic]

This issue is very hard to fix without using some profilers. I've been trying with nim profiler and valgrind and actually not that much useful info there. Actually nim profiler gets stuck when app comes to remote procedure call, and just start hanging, so output file is always empty. Using valgrind is slightly better, but it always end up showing to a calls from macOS dyld lib. I managed to see there a lot of calls to ImageLoader::recursiveBind from ImageLoader::recursiveBindWithAccounting (macos dyld class) and started to check how we are loading images in the app and applied some changes here.

If this fix does not solve the issue #3626, it will at least slightly improve performances.

[status-im-auto]

Jenkins Builds

❔	Commit	#️⃣	Finished (UTC)	Duration	Platform	Result
✔️	fbe5c8d	#1	2021-09-24 10:32:47	~11 min	macos	📦dmg
✔️	fbe5c8d	#1	2021-09-24 10:37:11	~15 min	linux	📦tgz
✔️	fbe5c8d	#1	2021-09-24 10:56:59	~35 min	windows	📦exe

[0x-r4bbit]

Another thing I've noticed is that the usage of DelegateModel in StatusQ to make Drag and Drop visually work causes the rendering to occasionally freeze.

This will get better once #3676 has landed as it removes DelegateModel again, resulting in a snappier front-end.

[anastasiyaig]

i removed the linked issue #3626 just to keep it opened since this PR is slow to me as well with my data folder, but at the same time it improves our code and does not make any harm so i suggest we merge it and i continue looking into #3626