Maybe change your tone and people might respond, be a bit more constructive and social. That being said...
...check the Avorion discord, there's lots of activity there. I for one didn't even have an account here, but have always been on Discord.
...while there is lag and performance issues late-game, what you describe would sooner be related to hardware being old or not up-to-date. I have 100's of hours in this game, never had anything more then a few lag spikes in busy sectors/battles.
...you do realise this game is already quite some years old? Its fairly understandable games' population dies out at some point. Happens to all games.