I have a 144hz monitor and my hardware should be enough for more fps. Is the game locked somewhere or something because more fps would not be bad.
You have to disable Vsync
Turn off Vsync
I had the same problem with fortnite. Reset all settings and uninstall all mods and texturepacks.
Maybe you accidentally chose a maximum FPS number in the settings (in Minecraft, of course).
And uhm, 140 FPS is not a number to complain about now.
Thank you
Em that will be of no use to you your screen only grabs the 144fps and no more.