well after 290 turns I stopped testing As I feared reducing range had too much of a negative effect on AI
at turn 194 a minor found me (never happened in prior tests)
by turn 247 TPT was 2:44 sec (and kept increasing) over 3:30 after turn 290
by turn 290 all AI races were either at war or had some kind of treaty (all 4 race knew other 3 races)
turn 290 AI system count was about the same 25 - 35 systems each
turn 290 Federation was only a few turn away before I was going meet them.
turn 290 AI ships count was 250 - 700 each race
so in conclusion to editing range, if you don't mind crippling the AI this patch would decrease TPT greatly. But in my opinion it is not worth it, especially for UDML with the improved AI changes.
So we are still hoping for a direct fix to the problem (still unknown exact location)
code to close borders for non aggression, friendship, affiliation (this would be a usable change with less AI impact)
at 0x5e3bc change 0F 84 -> 4F 02