[Transformer TF300T Android Development] pe1dnn:
Thank you forum members! Using MicroG seems to make a lot of difference. I had some problem installing it though. What I did:

Backup the content of /data/media/0. Oh yeah, also have a full backup of /data, a TWRP backup and Titanium backup. For emergency also the anti-brick files. So every precaution to recover and restore no matter what.

Buster99 to to back to stock

Boot stock ASUS, check and shut off

Boot to fastboot and install TWRP

Boot to stock ASUS, let it rest, shutdown, boot to TWRP

Then the installation of KatKiss (at that time 035) as per instructions but instead of gapps the MicroG package

Then boot to KatKiss.

First hurdle was a showstopper for me. At first Google Play gave a RH-02 error after logging in. In the MicroG configuration I enabled Google device registration and Google SafetyNet. But it didn't help, that is, until I rebooted the tablet. So that seems to be a requirement after changing this. But the next stop was to install Titatum backup to restore my apps and to install any apps because it does have the bare minimum of apps initially (which is good). I also got an update message for SuperSU. Now that update was stuck at 0% and also installing Titatnium backup did nothing. In other words, I could not install anything which is a deal breaker. Why this happened I don't know. Maybe because Google Play did initially not work it got in a wrong state. Any way, total failure.

So restored by backup and got everything as it was before.

Then I read ebonit's message, he just formatted /data and installed without first going to stock as I did. So I tried again, I can always go back anyway. So formatted /data; first ext4 which takes ages and then back to f2fs. I followed the instructions again to install KatKiss, but again use MicroG instead of Gapps. After reboot I first fixed the MicroG settings for Google. Google Play gave me the same RH-02 error after logging in, but a reboot - which I remembered now - fixed it and this time the SuperSU update worked fine and I could also install Titanium backup (or any other app for that matter).

I restored by /data/media/0 data (aka /sdcard) and restored the Apps I wanted from Titanium backup. Some did not work that way and had to be restored using Google Play which now works fine. First impression is that the performance is much better.

My suspicion is that the Goolge stuff does not use much performance from the CPU but does eat up RAM, and the amount of RAM on this tablet is on the low side from today's perspective. Just not having it in memory frees up all the space for the applications that matter. Even Chrome starts very fast now. Whatever it is, it is a big improvement.

I don't know what will happen over time, I only did it yesterday, but it looks very promising. Although the TF300 is not my main driver any more, it has since been replaced by an Aldi Medion X10607 which is much more powerful and up to date (by the way, I already received more updates from Medion than Asus ever did, so much for a premium A brand). It is nice to have the TF300 as a second tablet and I like the sport to extend it's life as long as possible just for the heck of it. And the TF300 is rooted and the Medion not, so the TF300 is more suitable for hacking. Now I still have to install 036...