Hi, I was using thesycon.de's Latency Checker with 1,000 us, then learned this tool was incompatible with Win 8 and found the xperf solution later on. I'm uploading my etl file here & wanna see if anyone can check what's my level of DPC latency ? Or how to reduce it furtheer ? https://onedrive.live.com/redir?resid=31298F6AADD51C61!12762&authkey=!AOexgnXWCc61t5M&ithint=file%2ctxt Thanks