This has been an ongoing problem with Camtasia when you start to edit projects that are 1 hour long it slows down insanely slow rather you use a lot of stitching of track or manually cutting them. I have 24GB of DDR4 Ram and I am only at about 50% usage for total system with all programs open including Camtasia..... My CPU is not even over 50% usage and my hardrive is not being maxed out either uses about 10 - 15% usage during playback and edits. My program just crashed randomly TechSmith really needs to fix this issue. My GPU is only at like 30% usage. I can't imagine why it is moving so slow to make a stitch or cut to video. Playback somewhat stutters and slow to react to me moving it to different time point in timeline. I think going forward I can't recommend using Camtasia for videos that are 1 hour or longer. By the way I have the latest version of Camtasia so that is not the issue I checked the update option in Camtasia and no more updates for 2020. It's very frustrating and I now have to explain to my client that I won't make the deadline due to this issue.