User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:51.0) Gecko/20100101 Firefox/51.0 Build ID: 20170125094131 Steps to reproduce: Fill a select input with few thousands of options and open the dropdown Actual results: Opening the select dropdown needs some time. The wait time is proportional to the amount of options, starting from half a second with ~1000 records to 2-3 seconds with ~8000 records (using an i5 with Windows 10). Expected results: Opening the select dropdown should need almost no time, regardless of the amount of options (just like older versions)
Thanks for filing this bug. This is already being tracked by bug 1118086. I'll close this one as a duplicate of that bug, but thank you for filing this bug and for letting us know.