cTrader vs FIX API Ticks per second, CPU

I have some questions:

1. Is there any limit on the number of ticks per second that the cTrader platform can provide?

2. One broker says FIX API can offer up to 250 price updates per second, though I believe it depends on many factors. cTrader server simply routes every LPs market data update directly the cTrader client or it "groups" them on any way?

3. I read that cTrader ticks are processed only by one thread and are queued until the current OnTick() ends, cTrader reserves one core only for the OnTick() function?

4. Do you think under highly volatile market conditions running a simple bot for saving ticks (to database) with many (20+) pairs, cTrader can consume much more CPU (and perform worse) than a bot using FIX API being the other factors equal?

Regards.