Feature: Improving Performance, optimizations, reliability and codebase

[d2dyno1]

Is your feature request related to a problem? Please describe.
A large number of users have been recently complaining over the performance, optimization and reliablity with Files. These requests haven't been really addressed before (at least taken with enough seriousness).

Describe the solution you'd like
These problems really should be taken care of. We should start with upgrading the codebase and its structure. This will help us later to work with it and solve performance issues.

Additional context
Since a new update just dropped we have more time now to work on some of the backend stuff.

Please reference this issue in every PR that focuses on optimizations to keep track of the progress.

• Home page, favorites and drives
• Thumbnails
• Startup performance
• Deleting large batches of files
• Less than 1% crash rate
• Improve performance when resuming multiple tabs from the background (restoring multiple tabs is visibly slow)
• Improve ram usage