Very Slow Chat

When I try to type in the chat for example saying Hello it would take at least 1-2 seconds just to type one letter. This was apparently resolved in 0.15 but it seems the bug may have came back. I am sorry I cannot post screenshot's as this is something you can't screenshot. This bug is killing me because I work on a third party server with a high traffic volume and I need to deal with banning players.

MORE CLEARLY: Chat is extremely slow, takes 1-2 seconds just to type one letter.

DEVICE SPECS:
Intel I3-core processor
DDR4 Memory 4.00gb
64 Bit x64
Windows 10
Lenovo Ideapad 510