We all know the problem. While your PS3 Trophy list grows and as more games you install, the synchronize process of the trophies becomes slower and slower.
Now I found a simple solution to fix this problem and speed it up.
Here is the How-To:
1. Shutdown PS3
2. Hold the power-button till the PS3 shuts down by itself after some beeps
3. Hold the power-button down again, till you hear a "double beep"
4. Unhand the button; now the service menu starts
5. Choose option 4 "Rebuild Database"
6. Done, now your PS3 updates the trophies very fast again
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