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Typed letters don't respond quickly.

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Typed letters don't respond quickly. There is a second delay. I must hold them down to type including the space bar. i use win. 11 dell computer.

Typed letters don't respond quickly. There is a second delay. I must hold them down to type including the space bar. i use win. 11 dell computer.

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What security software are you running? Did you try with Firefox in Troubleshoot Mode? https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode#search If you're running Windows Pro version, I would test in the Sandbox to confirm. https://www.howtogeek.com/399290/how-to-use-windows-10s-new-sandbox-to-safely-test-apps/

Disable it, reboot, and try again. I had the same issue in the past on Windows with Kaspersky. I forgot the setting that I had to tweak to resolve, but you should check their forum for help.