Best config for 2 participant conference?

What would be the best config options for 2 participant conference? I have an Android computer on my client and it’s not very powerful, and it doesn’t seem to support H264 at all, or at least when we tried, there was no image sent or received. VP8 codec and VP9 seems to work, but it’s very CPU intensive and sometimes image is laggy. So is there any tips how I could make the Jitsi use less CPU and still have decent image quality?

Find out which codecs the Android device has hardware support for (by researching the device model and/or chipset on Google), and use one of those codecs.

Some older/lower-end devices only support H.264 in hardware. If that’s the case for your device, you may invest some effort in finding out why H.264 didn’t work.