Steps to reproduce:

Switch to the sapi-5 synthesizer and read a long text.
For example, I used the NVDA build from source code in windows console.

Actual behavior:

There are noticeable delays before reading the text. Often, NVDA stops responding to any key presses while reading the text.

Expected behavior:

NVDA logs, crash dumps and other attachments:

nvda.log

System configuration

NVDA installed/portable/running from source:

Portable

NVDA version:

alpha-51845,8dffe620 x86

Windows version:

Windows 10 22H2 (10.0.19045.3693) workstation AMD64

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

Other information about your system:

Other questions

Does the issue still occur after restarting your computer?

Yes

Have you tried any other versions of NVDA? If so, please report their behaviors.

Yes, alpha-51821,5198ed54 x86
There is no problem, or it is minor

If NVDA add-ons are disabled, is your problem still occurring?

Yes

Does the issue still occur after you run the COM Registration Fixing Tool in NVDA's tools menu?

Yes