Hi,
After last update (about 3 week ago) it takes planty of time to insert number in cell. Sometimes it can take even 2-3 seconds after click until number appears in cell. Even when I turn off all other applications on my phone. I have quite old phone (LG Swift L3), but before last update I didn't experience such problems.
Thank you for letting us know. We think this may have to do with the ads being loaded. Would you try switching to full screen ads (under Settings, requires restart) and let me know if that improves the response time.