I found the solution. In my case, hiding the track which contains photos/videos on top of the main video stops this problem.
I've tried disabling the "SHOW DUPLICATED FRAME MARKERS" but no difference.

Having the same issue now. Resolved by deleting subtitle track in sequence. Remove srt file in bins, and reimporting provides temporary relief but it begins to lag shortly after. Disabling "Show duplicate frame markers" helps some.

I can't believe this is still not fixed. Switching to Da vinci now. This is just insane.

Crazy lag in 22.4. It was actually considerably better in 22.3

It's still lagging as of May 2022

still have this problem in Premiere 2021, not sure about 2022 but my production won't be moving to that version for some time. Puts the timeline at a stand still. Turning off "Show Duplicate Frame Markers" is a workaround. Zooming in on the timeline helps also, disabling tracks/clips does not help.

Well, this problem still applies in PP version 22.1.2. Duplicate, write a transcript, duplicate again.. It's very lag. It took 5 - 7 seconds until I was able to transcribe each duplication.

Bumping this post as this issue is still present (slightly improved) in V22.2 of PPro.

"show duplicate frames" disabled is the workaround. The bug should be addressed.

The workaround I've found in the adobe community forums that helps

If you completely close the Text panel, for me, it has become much less laggy to edit through the program window with the caption track on and playback quality at 1/2

I have always had "SHOW DUPLICATED FRAME MARKERS", DISABLED. and the lag issues are still very present.

Even with the video track disabled, and the timeline zoomed in to show only 3-5 caption clips at a time.

There is still a tremendous amount of lag between clicks and text updates through the program window, timeline and or the text editing window.

with these pc specs:
Windows 10, i9-9900k 8 core 3.6ghz base clock, 64gb ram, RTX 2080ti, 1440p x3 monitors, nvme main drive, nvme cache drive, and raid 0 working data drive (+ cloud back up)

as I am writing this, I am working through a 19 minute edit, with 783 caption clips. the lag between edits is definately testing my patiences

Chris Owens
It worked for me to disable "SHOW DUPLICATED FRAME MARKERS". I had no further issues with my captions. You can also choose to make the captions invisible but then you can not edit them.

I checked on "SHOW DUPLICATED FRAME MARKERS." That setting was already disabled in my most recent project timeline. Still dealing with massive lag once the captions were added. The timeline has almost 2200 captions. It's just over 1 hour in duration. The captions are single line to avoid interference with other graphics.

Please read this if you are having lag while working with captions!!!!

If you have "SHOW DUPLICATED FRAME MARKERS" enabled, DISABLE that function!!

I find that captions start getting slower to edit after about 50 segments. Once you go over 100, it starts becoming almost unusable. After hundreds, it can take several seconds after I type something before it appears on screen.

The temporary workaround I've come up with is to duplicate the timeline, and work on captions for a small section of the sequence. Maybe work on transcribing for about an hour, and then copy that work back to the original sequence. The problem happens when there are a lot of segments in the caption track, so if you can minimize the amount of segments you are actively working on, you can minimize the issue.

Obviously, this should not be something we need to do in order to work on subtitles.

Made a discovery.

if you can work this way, it helps if you disable the video track while editing the captions.

I'm having the same problem and losing significant productivity as a result. The longer the caption file(the more captions there are) as well as the further along in the timeline you are the lag increases. I've had the same problem on 3 different PCs. It takes me 3-4 hours to get through tweaking the transcribed captions for an hour-long video interview. I now loathe working with captions.

I am editing a webinar of 3 hours and edit captions, delete, create, move, etc. are really slow.

I have a nice PC: NVMe, 32 RAM, 12 GPU

Its a replicated frame problem.
If you use ‘show replicated frames’ just remove that option.

this needs to be escalated, its taken me nearly 4 hrs to edit the captions for a 15minute video!