MACRO_CONFIG_INT(BrMaxRequests, br_max_requests, 25, 0, 1000, CFGFLAG_SAVE|CFGFLAG_CLIENT, "Number of requests to use when refreshing server browser")
It's currently set to 25, which is quite slow for a modern PC.
I've set it to 96, which should be smooth enough for most players.cl_show_skin_chat
Screenshot: