Determining CPU load and isolating where it is being used is not something that can be done in a forum like this. It can take a lot of time. It’s also dependent on how exactly you are using the system.
The easiest way is to simplify your setup, eliminate things, determine what is causing the CPU usage that way. Others are using BLF and hints fine with no such CPU usage or problem.
my setup is very simple , i just ./configure with bundle and then make and make install, i dont change any selected field in make menuselect
how can i determine more information when system has lagged and delay on call?
Like I said, trying to figure out this stuff takes a lot of time and experimentation. I can’t take the time to do that. If you can’t figure out where to start you’re likely going to run into problems trying to isolate things. You already mentioned BLF and hints. What happens if you don’t use those? Does the CPU usage drop to reasonable levels? If so - then you’ve isolated it. That’s what you need to do.