BR's execution happen at server-side ( its actuall database triggers ) database their execution are not directly reflecting on pages unless forms are waiting form updated to be happen on BR execution.
The word "Perfomace Issue" is very wide in nature, every user has own explaination of "performace issue" , as admin/support team you need to monitor this as whole and check other things as well like slow queries, long running job, scheduled reports timings. Scheduled Jobs order & timing.
You can chage timing and execution order of other objects/process to keep instance breath at high time.
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