Dear sir or madam,
First of all - my spec are:
CPU: Intel Core i9 7980XE (Overclock 3,4Ghz)
GPU: NVIDIA GeForce GTX 1080Ti
RAM: DDR4 128Gb
System SSD: NVMe Samsung SSD 960 Pro 1TB
Data SSD: Samsung SSD 860 QVO 1TB
Cache SSD: WDC WDS500G1B0C-00S6U0

I am having some performace / stability issues.

1) Mask tracking is horribly slow compared to DaVinci Resolve
2) Old projects (like two months old that haven't been touched) are after reopening buggy. When I start playback and then I wanna stop it, nothing happens. It keeps playbacking and after 15-30 seconds it stops. (FullHD 25fps 25mbit source data)
3) When audio is mastered first, the project becomes really unstable. Playback is working, but we had to wait like 5 seconds for playback to start. (FullHD 25fps 25mbit project and source data)
4) Warp stabilizer is not working on proxy files - absolutely need this thing for CinemaDNG files
5) Even FullHD Grading is laggy. I can't precisely edit curves and other values because when I grab them the moves are chopped.
6) Time remaping is not working on nested sequences when CUDA is turned on

Anyway. Overall Premiere feels unstable and broken. Sometimes it just crash. Premiere sometimes doesn't feel smooth and using it when things go wrong can be really frustrating.

Thank you for your time and hope things will get better.

Fix the bug where a clip is selected on the timeline but when navigating to the effect controls panel no clip effects are found forcing you to reselect the clip you are trying to change the effects of.

This seems to occur specifically if after selecting the clip in question in the timeline, you select the source monitor (usually stacked with the effects panel) and then proceed to select the effect controls panel. Selecting the effects control panel immediately seems to work fine.

Subsequently, if moving from the effects panel to the source panel and back, the clip is then deselected in the effect controls panel.

As an audio professional I have hundreds of (licensed) audio plugins on my system, each in various formats (VST3, VST, AU, AAX)
Managing which plugins Premiere should load is frustrating and time consuming because in the Audio Plugin Manager I can only select ONE PLUGIN AT A TIME.
To eliminate duplicate plugins appearing in the Effects panel (where it is not clear which format you are selecting), I want to keep just the VST3 or VST versions, and ignore the AU versions for cross platform compatibility. So... I can achieve this but only one at a time and it takes forever and is prone to error.

Why can't I select multiple plugins and select/deselect all of them at once? Right now this entails hundreds and hundreds of individual mouse clicks to deselect the ones I don't want, every time I update and rescan my plugin library.

First of all, the markers window on Premiere runs like a slideshow from the 1920s when I use it on my Windows 10 Threadripper PC. On my Macbook Pro, it runs fine. Why is this?

Undo doesn't work in the Markers window. Is this a keyboard shortcut issue that I can fix on my end?

My workflow is to put markers on my video when I hear a bite that I like. Then I go to the marker window and find bites that I like and put them into the sequence. This has a ton of problems. First of all, I can only see about three words of the Marker labels. For me to work, I have to copy and paste all the titles into the description fields. And I have hundreds of markers. Not only is this tedious and unnecessary, but if I make a mistake, there's no undo available for the marker window for some unknowable reason.

Then, when I choose a marker, the marker window changes depending on which window is active. It also scrolls away from where I was when I switch active window and switch back. If you could add a feature where I could lock the marker window so I'm not constantly losing my place, that would be wonderful. It's an issue on my Mac where I can scroll through it, but it's a world ending bug on my PC because I can't even scroll, the performance is so bad.

If you could fix these problems, my workflow would improve exponentially. People do use the marker window, I don't think you think we do.

Have you ever run into a situation where you want the ability to adjust an effect across multiple clips automatically without having to copy and paste them manually? I run into this problem all the time and the workarounds I've come up with (a whole lotta nesting) aren't the fastest nor best solutions. I would propose that this linking (which is really just linking the numeric values) work in a very simple and easy to understand manner such as this:

case 1: you have a serious of 15 clips that you want to apply a brightness and contrast effect to and you know you will want to change them all together but occasionally individually. You select the 15 clips and draf the effect onto the clips, isntead of simply applying the effect it also creates a link and turns on a chain icon next to the effect's name. Now when you want to change them you simply select the clips and begin changing them in link, if you want to change one on it's own you simply select said clip and linked effect and click the chain icon which unlinks the effect until re-engaged.

Every time I use the subtitle tool I encounter a new issue, clearly this feature hasn't had much testing, with multiple forums posts showing many users experiencing the same difficulties:

Export options disappearing (solution: roll-back to an obsolete version of premiere)

Title tracks not updating in timeline despite being updated in the subtitle tool (solution: edit the set file externally)

Not being able to export baked-in captions through media encoder (apparently fixed but I still have this issue)

Free subtitle software, and even the free version of DaVinci Resolve makes subtitling far, far easier, so why not just start again Adobe?

Redesign the tool, make it easier and more reliable.