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If you are still having performance issues, your media is probably too heavy for your computer. It's a common problem as footage these days is so highly compressed. Even expensive computers can struggle with certain footage.
For example, 4K H.264 or HEVC media from your camera or mobile device needs additional handling in order to edit with it smoothly in most cases (especially 4:2:2 10-bit video). In that case you'll need to do one of the following:
Disable "High Quality Playback" in the Wrench (Settings) menu in the Program Monitor.
Choose Preferences > Memory and allocate more RAM to Premiere Pro, but not so much as to starve the OS.
Choose Project Settings > General and ensure Mercury Playback Engine GPU Acceleration is enabled.
Make sure you are working with your media on high speed hard drives connected via your motherboard or a high speed port.
Render the area that is lagging. Set In and Out around the area and choose Sequence > Render In to Out. Use also the Render and Replace function for sections of video that have heavy effects.
Close unnecessary panels if you are not working with them, like Lumetri Scopes.
Performance isn't as good as ProRes, however, may be OK for a shorter or smaller editing sessions. File sizes are much smaller, as well.
Things to keep in mind:
ProRes, etc. temporarily takes up a great deal of storage.
These intermediate files can be deleted after the project is complete.
Media Encoder might not be able to import the files. In that case, use the freeware, like, Shutter Encoder, which transcodes all files to either ProRes or back to a playable version of your .mp4.
Upgrade RAM by adding more RAM. Try 32 GB for editing with 4K footage.
Upgrade GPU: A GPU with 4 to 8 GB VRAM is what to look for at a minimum.
Upgrade hard drive: Solid state drives are very fast and work well.
Upgrade CPU. Only the most modern ones can playback 4K at 4:2:2 10-bit.
Adequate cooling: make sure that your computer is not becoming overheated by not staying cool enough. Install monitoring software to make sure that you are in the right zone for cooling. Upgrade fans or another system if you need to.
Click the "Global FX Mute" button. This temporarily disables all effects. This allows for smoother playback.
Beleive it or not there are many things that can effect playback when using Preiere Pro. Quick Sync, CUDA Open CL and ASIO etc. It takes a while to get Premiere Pro tweaked out 100% as seen in the video below.
I may be the only person in the world with this issue but I eventually figured out that my playback was laggy because the default audio input was wrong. I went to Edit --> Preferences --> Audio Hardware --> Default Input. The default input was the mic on my ancient webcam from like 8 years ago. I switched it to a more modern microphone and the playback improved a lot. I assume switching it to be nothing would have worked to (I'm not using the audio input for anything) but I didn't confirm that.
Thanks for mentioning this, John. I have added your comment to my list of Performance issues I am advocating a fix for. There are numerous bugs to upvote with the following search on User Voice. Please upvote the bug that most closely matches your case here.
I was almost breaking down when I tried switching the audio latency. I don't know why it was also picking old preferences but anyways, changing from 30ms to 100 made it work like a charm!
Kudos to you, Collin Smith. Your section on hardware solved my problem of dropped frames. The cinematographer gave me the raw video and audio on a thumb drive. I plugged the thumb drive into my computer and never downloaded it into my harddrive. So, when I tried to use Premiere Pro, I got a stuttering of video. Dropping frames like crazy...transfer of data from the thumb drive into work station. Transferred the raw video and audio onto my harddrive and...puff, problem gone! In my thickest Chicago accent "YOU DA MAN"
I may be the only person in the world with this issue but I eventually figured out that my playback was laggy because the default audio input was wrong. I went to Edit --> Preferences --> Audio Hardware --> Default Input. The default input was the mic on my ancient webcam from like 8 years ago. I switched it to a more modern microphone and the playback improved a lot. I assume switching it to be nothing would have worked to (I'm not using the audio input for anything) but I didn't confirm that.
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