Slow Obsidian operation speed

Things I have tried

My Obsidian is V1.0.0, and I updated my plug-ins and theme that I could think of. The software just runs slower and slower. I start to suspect that I did something wrong with it and caused it.

What I’m trying to do

My Obsidian is running unbearably slow now. For each click, it delays a few seconds to respond to it. I am using Windows 11, and the hardware should be fine because other software runs reasonably fine. Anyone has similar experience and know how to speed it up?

try turning off plugins and css and then turning them back one by one and see how that goes. I had the same problem a few days ago and turned out it was one of the plugins so I leave that one off for now