You should report an issue with your specs, not just say “other applications don’t have this problem” — especially as a Linux user.
For one, not all applications are GPU accelerated.
Two, their UX may need to be improved for a specific hardware configuration. I have used Zed with good performance on Intel dGPU, AMD dGPU, and Intel iGPU without issue — my guess is a missing dependency?
Meh, it's not worth the trouble. I don't care enough about using Zed to fix their Linux distribution problems or debug something for them. This isn't some volunteer backed FOSS project where they get a free pass or free QA work from me.
What's the point of commenting that it's slow if you don't care about using the program and switched to something else? Also, how is whether the project is volunteer-run relevant? Would you file a support ticket for commercial software you use saying "it's slow" and then when they follow up asking for details about your setup, you say "sorry, you don't get free QA work from me"? Do you really think that would lead to them fixing your performance problem?
