It is well-documented in older threads and support posts such as https://support.techsmith.com/hc/en-us/articles/203729298-Camtasia-Windows-Crashes-or-runs-slowly-du... that the Camtasia Studio editor can slow down or even crash if you have a big project file with many timeline edits. The usual suggestion is to produce a temporary "Work In Progress" video with the edits made so far, and then load it as a new project to do further edits off that. The problem with this is that every time you produce a new output file, you introduce compression to the audio and video. Doing this multiple times leaves you with a final project output that is very lossy. Disk space is cheap these days... particularly for those of us who regularly do large edits like this. It would be great if TechSmith could add an option to do a full, uncompressed Work In Progress save that "flattens" or incorporates the edits made so far so they can't be altered, and allows further editing as if you were working with a fresh file. The source audio and video would need to remain at the same resolution or quality as they started from. Then the final output video could be produced with just the one final level of compression for the desired format.