Not having a real local card doesn't necessarily mean its a bad server.
What does the log say?
Is it timing out when the freezes happen or is it returning junk ecms?
Unfortunately I upgraded to openatv 7.3 without having a backup and I cannot provide logs right now. I’ll get back to you when I set up everything again.
As I can remember though I didn’t see anything weird in logs. Consistent requests with roughly 150ms per request.
What was weird though was that the non Icam requests were taking longer ~400ms without freezing.