Merge pull request #3205 from Citadel-Station-13/upstream-merge-31374

[MIRROR] High pop reduced MC processing mode.

code/modules/client/client_procs.dm

@@ -352,6 +352,7 @@ GLOBAL_LIST(external_rsc_urls)
 			menuitem.Load_checked(src)
 
 	hook_vr("client_new",list(src))
+	Master.UpdateTickRate()
 
 //////////////
 //DISCONNECT//
@@ -399,6 +400,7 @@ GLOBAL_LIST(external_rsc_urls)
 	if(movingmob != null)
 		movingmob.client_mobs_in_contents -= mob
 		UNSETEMPTY(movingmob.client_mobs_in_contents)
+	Master.UpdateTickRate()
 	return ..()
 
 /client/Destroy()