Adobe Premiere pro 2021 Playback Lag

[Future5FCE]

My Pc Spec:
Windows 10 Pro 20H2
Version 10.0.19042 Build 19042
Windows Feature Experience Pack 120.2212.551.0
processor: Ryzen 5 3600
Gpu: XFX RX570 8gb
Ram: DDR4 16gb(dual Channel)
Mobo: msi b450 max gaming plus
psu: Antec 550W

when i input big file like 4hr+/10gb+ or any file my premier pro 2021 performance too bad when i play video in it but there is no problem with audio and also if i use premier pro 2019 there is no playback issue or anything untile i export it.when i export project with pp2019 or encoder 2019 both are crashing all the time. i dont know what should i do i tried many tutorial but none of them are worked. please can anyone help me?

[basil1891]

Possible remedies, try one by one

1) Manually clear media cache - close Adobe PP/AE/ME, go to cache location and clean/delete folders: Media Cache, Media Cache Files, PTX, Peak Files

2) Turn off hardware accelerated Decoding in Preferences > Media...  (Remember to do app restart)

3) try Preferences > Audio Hardware > Default Input => select "No Input"

4) Reset workspace: Window > Workspaces > Reset to saved layout (or just switch to different one)
5) Try on/off "Mercury Transmit" option (Preferences > Playback > Enable Mercury Transmit)

6) Reset app preferences: close all Adobe apps, go to My Documents > Adobe  and rename folders Premiere Pro / Adobe Media Encoder. Now start the app while holding Shift+Alt, open your test project and see if there is any improvements.

7) play with other settings on the Audio Hardware  page: Device class, Latency, MasterClock