Every time I add transition makes the playback lagging

[Stiven5C8F]

ryzen 5 5660x

rtx 3070 ti

16gb ram

[Jaap H]

Could be several causes here...

Most built-in transitions are non-realtime and cause a red bar over parts of your sequence. 

• Please specify the video transition(s) you are talking about. 
• And what is the sequence resolution and frame rate?
• Do you have any effects applied to the clips?

Sounds like you have a pretty solid machine there — 
Still, the render speeds of video transitions can differ quite a lot. 

[Stiven5C8F]

So, I have a 1440p resolution recording and 60.0 frame rate, It is just a
simple game video, I also use my gpu (CUDA) for premiere but it still lags,
and also you mentioned that the applied effect will create a red bar, but
actually it is yellow like it should be. There aren't any effects applied
to the original clips.

[Kevin-Monahan]

Hi Steven,

You might try transcoding the game video to ProRes LT and then editing it. Video streams often have a variable frame rate that Premiere Pro cannot handle well. Furthermore, an AMD CPU isn't optimized for editing H.264, as it does not have Quick Sync technology like Intel CPUs. ProRes codecs are more suitable for AMD CPUs.

Use a free third-party encoding tool, like Shutter Encoder, as Peru Bob mentioned. This application will allow you to transcode to a CFR format, like ProRes LT. You can also transcode back to H.264 at a smaller file size, but most editors prefer to edit with a ProRes codec for better file handling, performance, and export speeds.

Let us know if transcoding helps solve your problem.

Thanks,
Kevin

[Peru Bob]

Please use the free MediaInfo and post a screenshot of the properties of your media in tree view:
https://mediaarea.net/en/MediaInfo

Many users are having issues with VFR. If the file is variable frame rate, use Handbrake to convert to constant frame rate:
https://handbrake.fr/downloads.php
Here is a tutorial:
https://www.youtube.com/watch?time_continue=34&v=xlvxgVREX-Y

Shutter Encoder may also be used to convert to Constant Frame Rate:
https://www.shutterencoder.com/en/