Hi,

Several users of reported performance and display model regressions in NVDA 2017.2:

• When using OTS Studio (a broadcasting software), when scanning thousands of files, it used to take only 90 seconds with 2017.1, but it takes up to five minutes in 2017.2.
• In mIRC, when new messages arrive, NVDA repeats some messages or there is a noticeable delay when message window is updated.

After doing git bisect, it appears either one of the following might be responsible:

• execInThread
• Transparent text color handling in display model.

Thanks.