Importing .mov files in blender sequencer is very laggy I have seen a couple other people ask this question but I have yet to find an answer. When importing an mov file into the blender video sequence editor, I find that the program becomes extremely laggy and cannot playback at more than 4fps. Is there some special way to import a .mov file? Or can we officially say that importing an .mov file to blender is something to be avoided?

My solution was to export the mov file as an .mkv file and when I import that into the editor it works very fast. It is something specifically about trying to edit an mov file that blender doesn't like. Here is another link concerning this. I tried their solutions and I did not have success:

why is the video sequencer so slow with 4k files 2.79

Is anyone having success with mov files in the video sequence editor? Just to be clear, I am importing an mov file, not exporting my project as an mov file
Importing .mov is not the issue. Mov files are quicktime files. Quicktime is a container that can hold video files in a variety of different compression codecs. Some codecs are more efficient than others. Some codecs require more from the CPU than others. Some require faster drives to sustain the data rate. Some are fast and easy to play at the expense of quality. All quicktime files are not created equal.

The same can be said about mvk. It is a container, that can encode in different codecs. Some will work for you, others won't. Sustaining the data rate depends depends on the codec and the resources available on your computer.

But the bottom line is that editing 4k video requires a lot of computing power, and/or clever optimization. Blender's video editing capabilities are quite limited and antiquated. To deal with video you would be better off with a real video editing app. Most of them can play video more efficiently than blender, using GPU acceleration and multithreaded operations. Blender uses none of that.

Blender is a great 3D app but the vse's performance and design is sub-par to other apps out there in the real world.