Yosemite - Samsung 840 Pro Significant Slowdown

I have upgraded my MacbookPro 15" Early 2011 with a Samsung SSD 840 Pro 512GB. It was performing extremely smooth and well using OS 10.9 (Mavericks).
Last week, I have upgraded the OS X to Yosemite and now I'm experiencing frequent significant slow down (significant waiting time for disk access). Is anyone experiencing the same problem and if there's any solution out there?
- MacbookPro 15" Early 2011
- 8GB
- Samsung SSD 840 Pro 512GB
Previously installed TRIM Enabler (which disabled the Kext signing). After experiencing significant hangover time, I have disabled TRIM and reenabling the Kext. However, it doesn't help. My laptop continues to experience significant random slow down and hangover. It didn't crash but the disk access is definitely not performing smoothly. Significant slowdown appears to be more problematic when running Parallels 10.
Thanks for your help.
Victor

anyone?

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