Steps to reproduce:

NVDA is very sluggish in several scenarios in Visual Studio 2017, below are 2 examples:

Intellisence

• In a blank console application, I start typing "Conso", and wait. After 1 or 2 seconds, NVDA announces "Console".
• I press ".wr", and wait quite some time before NVDA says "WriteLine".
• When using Narrator, feedback was very quick.

New File Getting Focus

• Start with all files closed.
• Press ctrl+shift+F, to open "Find in files", and type "main", and press enter.
• A multi line text field will get focus, and you cursor up/down to read the (probably only one) line which contains this text. However, initially NVDA will still say "main", as I cursor up/down, as I believe it is still read the contents of the text box in which I typed (even though it isn't visible on the screen any more). After a few seconds, it will start reading the search results as you cursor up/down.
• Now, press enter on a search result and start pressing up/down - again, NVDA keeps reading the search results even after the code file is open. Eventually it catches up.
• Also try putting the cursor on a keyword, like WriteLine, and press F12 to go to definition. A new source file will open with the definition, but again, if you cursor up/down you'll keep hearing the original file, for some seconds, until the system catches up.

I used the example of pressing cursor up/down, but the same thing happens if you press capslock+L to read current line - it keeps reading the old line for some seconds.

Narrator is very sluggish during these operations, so it is hard to make an equal comparison, but I do not believe it suffers from the same problem.

Actual behavior:

As above, NVDA very sluggish.

Expected behavior:

Instantaneous feedback.

System configuration:

NVDA Installed/portable/running from source:

Installed.

NVDA version:

2017.4

Windows version:

Windows 10

Name and version of other software in use when reproducing the issue:

Visual Studio 2017, version 15.7

Other information about your system:

Other questions:

Does the issue still occur after restarting your PC?

Yes

Have you tried any other versions of NVDA?

Yes