malbenni ,
Sorry that you are seeing this issue. I have filed a PR for the dev team and they are looking at the problem.
Can you give us the version of MyEclipse you are working with ? Paste the Build ID here from Help > About MyEclipse Enterprise Edition > Build ID.
To improve performance I suggest you change the JS mode to Basic mode. To change your JavaScript code analysis mode, go to Window > Preferences > MyEclipse > Files and Editors > JavaScript.
Hope this helps.