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    copied!<p><strong>UPDATE:</strong></p> <p>The solution was to mock around with #import <code>"header.h"</code> statements. It looks like Xcode requires a lot of processing power for intellisense when you you have complicated / circular imports structure (tracked down by performance tools - Xcode was falling into infinite recursive function call loop). <strong>When I moved as many imports I could to the implementation files and used forward declarations in headers, the problem went away.</strong></p> <p>This is what I have tried before:</p> <ol> <li>Reinstalling (complete removal by: sudo /Developer/Library/uninstall-devtools –mode=al) and installed new version 4.0.2 - Did NOT help at all. Anyway - Is it really complete removal as my main custom Xcode preference settings has survived)?</li> <li>Defragmentation (iDefrag - full defragmentation with rebuiling B-Tree and Metadata) - Did NOT help at all.</li> <li>System cleaning and antivirus scanning - CleanMyMac, MacKeeper - did NOT help at all.</li> <li>Organizer - Repositories - cleaned all repositories (I use Git and Xcode somehow stores list there for its own reasons even if I use only command line to manage Git) - small improvement.</li> <li>Organizer - Projects - cleaned all Projects from the list except opened ones - small improvement</li> <li>File - Source control - disable Show Remote Status (was enabled somehow, thx to ThomasW for pointing to that), but did NOT help much.</li> <li>Xcode - Preference - General - Disable Auto-Save (prompt only) and both Live Issues (In Editors, In Issue Navigator) - <strong>quite a bit of improvement.</strong> </li> <li><strong>Closed Utility Panel and Quick Help Pane - the biggest improvement!</strong> . I can finally type smoothly again! What a surprise. Such a trivial solution. It looks like help indexing / search assistant simply sucks! Why it does not do lookups in the background or something?</li> </ol> <p>Xcode is still slow but now it is almost possible to work with production quality performance. Anyway it is quite a shame that Core 2 Duo 3,06Ghz / 8BG DDRIII Ram / Momentus XT SS Hybrid can hardly make it. I was so close to buy OCZ Vertex SSD or some other super extra SSD because of this.</p>
 

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