Problem/Bug Server lagging only when I connect.

For some reason the server I am running recently starting lagging, but only when I connect. It is throwing out the Can't Keep Up! error. I found an older thread (from 2012) that was little to no help. The server continuously runs further and further behind, typically starting at 100 ticks behind and getting worse from there. It seems that none of my friends who play, when I'm not playing, experience any lag. My run.bat file is set up as follows:

@Echo off
"C:\Program Files\Java\jre1.8.0_211\bin\java.exe" -server -d64 -Xms4096M -Xmx4096M -jar craftbukkit.jar
pause

I just changed the first '-Xms4096M' from '-Xms1024M'

I am running the most current version of Minecraft (1.14.4) and the like version of CraftBukkit.

I have the following plugins installed:
EssentialsX
Multiverse Core
Multiverse Portals
PermissionsEX
Vault
WorldEdit

For some reason this did not start happening until after I installed an alternate version of Minecraft with OptiFine and the SEUS-Renewed shaderpack. Although I am not currently using this alternate installation of Minecraft to play on my server, I though there may be some correlation between this and the issue I am experience with my server.

Full Server Log -
https://pastebin.com/ih2VMNTF

Any help on this issue would be much appreciated.

*UPDATE*
Server just crashed on me while I was seeing if it would work with just me in it. Crash report is here - https://pastebin.com/ZSv8z2z4

 

https://pastebin.com/ih2VMNTF
@timtower