>>364587928
Serious question, do you not know how light probes work?
Light probes don't cause any lag, they're basically always accounted for in the shader even if you don't have any, because they're so cheap. It's literally one of the cheapest things you can do in Unity, both in terms of memory and CPU.

The real thing you have to look out for in terms of ambient lighting is having Realtime GI enabled (which you actually might have enabled, considering it's you we're talking about).
Light probes are literally free, please use them.
signed, a random anon who knows how shaders and rendering works.