Would you mind telling me if you're also finding it slow when the vault contains a lot of files? I do have some community plugins installed (the usual stack, I'd say), so it might be that they're the cause, but I'm not sure. And, I'd say the machine is reasonably fast for this type of task (random hexa-core laptop). It will take a second to switch notes, and opening up the graph view is also super-slow. I'm wondering if Obsidian has become bloatware.
How many notes do you have? I just have 150. For me, it takes around 3 seconds to start up Obsidian where the first thing it opens is the graph view. I think it takes longer on my phone especially because it has to wait for iCloud sync.
I think I have somewhere around 1k notes. Startup time is not my concern as I keep it open all the time. It seems like I bumped into https://github.com/zsviczian/obsidian-excalidraw-plugin/issu... tl;dr: Minimal theme doesn't get along with Excalidraw.