Debugging became painfully slow

[jury]

I'm diving into depths of open source implementation of old DOS game with gdb through code::blocks.
All worked fine for quite some time, but today debugging sessions slowed down like 100 times. Normally, there is a 2 second animation drawing the main menu, but suddenly, this animation is so slow, that after half a minute its not even half through (never waited longer). When I run the project through F9 it has normal speed (tried to rebuild whole project).
I must have probably done some shortcut switching something on/off or the like. Anything comes to anyone?

Code::blocks 20.03
Salix 15