Severe Lag on realms post 1.13 launch

Severe realm lag post 1.13. Worked flawlessly on 1.12.2. Flying with elytra is near impossible and even when walking it will lag for 3ish seconds every 10 seconds. Even crashed today. Single player works fine. Friend I share server with has same issue. He has similar specs. Tried all the troubleshooting recommended by support. Tried also to revert back to 1.12.2 but not allowed on realms.