Slow Web Frontend respond

I finished a fresh install (2.3.9) on a barebone PC and appeared that web frontend is very slow on respond. I have plenty of free RAM (500Mb of 16GB used) and cpu is getting close to 5-6%.

Any idea where I can dig about logs/issues?

The same here. Hard to do anything. Everything is with delay.
Fresh install, just basic programs, decent server.
Please help