Hello, I would like to tell you,
that 1.15 servers are still unplayable and its still bad optimized.
Could you please like work with it? Its since 1.14.x, of course its better, but minecraft is multiplayer game too, and its unplayable when there are 20-25 players online.
Timings: https://timings.aikar.co/?id=c46f5f5e0b364b86b94f8d2090c797c3
Please, I hope one day that Mojang will fix all server problems since 1.14.x.
Your report does not contain enough information. As such, we're unable to understand or reproduce the problem. Moreover, your link leads to timings of Paper, which is non-vanilla.
Quick Links:
📓 Issue Guidelines -- 💬 Community Support -- 📧 Customer Support -- 📖 Game Wiki