Hi @Nic,
Good day and thank you for posting in Microsoft Q&A Forum.
Based on your description, I really appreciate the time you've taken to investigate the behavior. To ensure we’ve covered everything, could you please help confirm a few additional details?
1- May I know the behavior is also occur in your Word Online?
2- You mentioned trying a Quick Repair, have you also performed an Online Repair? If not, I recommend proceeding with it, as it reinstalls the entire Office suite and can resolve deeper issues. You may also want to restart your PC afterward to ensure all changes take effect.
3- Could you please share the version of Word you're currently using? Also, have you tested the same behavior on a different device, such as a colleague’s or family member’s laptop?
4- May I know that you're using a microphone device to dictate word? If so, could you please share any troubleshooting steps you've already tried? Also, could you describe more clearly how the slowing down behavior occurs when it slows down?
Thank you for your time, I'm looking forward to your response.
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