Delays and random lags

[LubergAlexander]

Hi,

Thanks a lot for a detailed explanation of how to wire it up, great work!

I have assembled it slightly differently, since I am using this RN-42 from Sparkfun, instead of HC-05.
https://www.sparkfun.com/products/12576

I have this keyboard: https://mechanicalkeyboards.com/shop/index.php?l=product_detail&p=1564

My idea is to fit the whole thing inside the keyboard, so instead of soldering HC-05 on top of the board, it attaches directly to FTDI pins, which makes it USB port height.

At the moment it is still outside, and I am powering it from the power supply, 5V.

Bluetooth keyboard is discoverable on my Mac, and I can type without any noticeable delays. But if I press and hold a key, sometimes it works, sometimes it stops after 5-10 characters, randomly, as I type it misses some characters.

Have you noticed something like that? I heard something about fast data mode for RN-42, but I am not sure what is the root cause here.