What size search range were you using? It must have been a somewhat small one relative to GPU speed.

I don't know the exact range, but yes it was relatively small, so I knew I could scan the full range with 30 Minutes on a Google Colab T4. That made me wonder, is that specific for a small range, or will it happen with a large range as well, only that I don't notice it (so easily)...?
I tend to test in small steps, so I can see what happens. The numbers are so huge, that my small brain has to split it in smaller bits... and I don't want to run a test for several weeks to find out my idea is not working at all and I just wasted resources.