hi @s_xu welcome to Discourse Meta support forum.
Can you please provide as much detail as possible about your install and situation? For example:
- Is your Discourse version up to date?
- Is it a standard install
- Are you self-hosting or hosted?
- Are there any errors in the dev console when your site is loading?
- Have you installed any plugins or theme components recently?
- Is this only when you first log in - that is, do the pages load normally once you are logged in?
- what do the
/logs/show?