## Ticket
"Overall React Lag or Extra Re-renders / Volume slider laggy since v0.48"
## The problem
Every redux update results in each mounted component's prop mapping function (the `select` and `perform` stuff) to be recalculated. This is normal per redux, but we do lots of heavy stuff there.
The slider was sending tons of redux update for the Volume and Muted setting.
## Changes
The redux volume/muted setting is just used to restore vjs to the user's setting on the next video, so it doesn't need to be updated immediately/constantly -- vjs keeps it's own video settings. Debounced that action.
- 251 Dragging the floating player is super laggy
Recent changes and/or refactoring combined the effects or added dependancies into the effects, causing them to re-run excessively.
- Restored effects to their original behavior.
- Don't perform the position check when dragging -- only do it when released.
- Do proper debouncing for the 'resize' listener -- the previous method was incorrect as a new function is created on each render.
## Issue
60 setting.Get calls spiked since October
It was called 24 times per livestream page load.
## Notes
The effect was intended to be a one-time effect, but the dependency was changed in 2f4dedfb
## Issue
40 Linked comments doesn't scroll for deep replies
## Notes
Don't need an effect for this, plus it was causing the parent to not pick it up for auto-scrolling.
## Issues
- The current version of the link handler doesn't seem able to control the livestream player's position.
- The "live" position is always 0:00 and everything behind it is a negative timestamp. The current timestamp parser doesn't handle negative values.
* adding functionality to detect user download speed
* calculating bandwidth speed more intelligently
* saving download speed and updating it every 30s
* all the functionality should be done needs testing
* fix linting
* use a 1mb file for calculating bandwidth
* add optional chaining plugin to babel and get bitrate from texttrack
* allow optional chaining for flow
* ignore flow error
* disable bandwidth checking functionality
* fix flow error
