Eclipse gets stuck saving copy and paste

When editing long code in eclipse, eclipse often gets stuck for a long time when using Ctrl.  
the guess is that you can click and jump to the variable definition after holding down Ctrl in eclipse, so when you press Ctrl, eclipse will generate this mapping. When the file is large, this behavior will take a lot of time. You can set shortcut keys by the following methods.  

Eclipse — Windows-> Preferences-> General-> Editors-> Text Editors-> Hyperlinking:  
Remove this option: enable on demand hyperlinks style navigation  

Read More: