I meanwhile installed your LibreElec fork 9.2.8 on my Wetek Openelec Box (Play 1). It works surprisingly well, but I can "feel" that the device is a bit laggy. But this is nothing new. Compared to my other device (Wetek Play 2), the WP1 is indeed much slower.
Unfortunately, there is a 2-generation distance between the SoCs integrated into WP1 (M6) and WP2 (GXBB), so it is not only in clock speed and number of cores that WP1 lags significantly behind. Not even support for the mainline kernel would change that. As chewitt says, this SoC is unfortunately now obsolete.
- TV Play -> some channels become laggy after a few seconds, not sure yet why, could be because of mutex setting
In the Kodi 18.5, a significant change was made by the author to determine the interlaced signal and frame rate, which unfortunately is not really compatible with amcodec. I solved this with my own patch, but it takes 1-2 seconds after the channel change for the exact frequency to be determined. The lag is probably caused by this method, but without this patch, you had to watch a black screen for about 10 seconds after each channel change.
- Remote Control (official with the device) -> certain buttons needed to be re-configured using the Keymap add-on (e.g. Context Menu, Favourites, Mute button)
I used the official LE remote control keymap, but I found that it is not optimized for the remote control included with the OpenELEC version.
I noticed that the video player does not show the control buttons (stop, play, rewind, forward) and other options (movie info, settings) anymore when I pause the movie. I tried different skins (Amber and Confluence) but the behaviour is the same. Is there a specific interface/video setting to re-enable these buttons? I hope you know what I mean.
This is also related to the remote control, the same is true for WeTek Core. The keymap assigned to the WeTek remote itself overrides this behavior, but it already worked the same way in the official LE 9.0. There may have been a discrepancy in LE 8.2, but I've tried it so long ago that unfortunately I don't remember.