When I copy/paste by Ctrl+C/Ctrl+V or typing code, my eclipse quite delay 3-4s to handle. Sometimes, it caused that my CPU has loaded 100%. I really need adivices for this issue.
it's maybe be a bit late for OP but i've experienced same behavior when using CTRL+C/CTRL+V (and CTRL+Space)
i've seen that ctlr may be used to perform hyperlinking. Then i mapped the hyperlinking modifier key to ALT (General-> Editors-> Text Editors -> Hyperlinking) and eclipse is not lagging anymore when i try using CTRL+C/CTRL+V