How can I streamline my video editing workflow on my Mac for social media content creation?

I run a small video editing agency and often work with short ads and commercial videos primarily for social media. I use Final Cut Pro, but I sometimes feel the process can get a bit sluggish when dealing with multiple formats, transitions, and effects. Does anyone have any tips for optimizing the editing workflow? Are there any tools or plugins that work particularly well with macOS to speed things up?

[Edited by Moderator]