Hello,
There is no way to disable the anti-cheat program. Before turning off your A/V (which we do not recommend mind you), did you check for any blocked or quarantined files? If there are some, you will need to find a way to resolve the conflict before continuing. If there are no files there, we recommend to add exceptions for Last Chaos and XIGNCODE.
You can also check other background running processes and turn off those you do not require while playing. Then restart one by one until you find the culprit. Unfinished or pending updates for Microsoft or other programs such as Adobe or system drivers will also cause issues as they are priority when pending. Malware can cause instability as can being too far from the modem/router on a wireless connection.
I hope one of these ideas helps you, unfortunately there is not an "easy fix" as everyone's PC is different and there are literally millions of possible hardware and software combinations which we cannot possible know. We can only provide general avenues which you can start down in hopes you can come across the issue and resolve it therein.
Good luck.