I mean, it’s an interesting one and I proved myself one more time that my reaction time is still pretty terrible.
Disclaimer: accuracy of the results highly depends on the device you use and the software implementations of the tests. Do not use this app for self-diagnosis. Only designated and certified pieces of medical equipment can be used for accurate medical measurement.
I use heliboard, and it’s definitely lagging compared to default google KB when typing on my phone.
I tried it on a tablet with 1 Gb of RAM. Most likely your device has a ROM issue.