The challenge https://coord.info/GC5BA51 has a checker but it does not work if you have to many found logs. The challenge is intresting so please, take a look at the checker and see if you have a solution so it works for everyone!
I'm the author of this checker.
Hopelessly this checker is already highly optimized, however it require heavy time consuming search, so sometimes it is not possible to finish the search in real time.
So I'm sorry, but it is not possible to optimize it more.
Maybe that finding one more cache the checker finds the right combination for you.