I installed an Intel X25m G2 in my MacBook Pro (unibody) some time ago. Worked like a charm. When the patch to enable Trim support on Leopard came out, I applied that and subjectively felt an increase in performance. Last year in October I switched to Lion and lost the patch again. A couple of weeks ago I had the feeling that my Mac had become a bit sluggish (boot performance, application start-up etc), so when the new Trim patch for Lion came out I happily applied that as well, thinking that this would counter the performance loss. However, little changed. I did an XBench a couple of times and get these results: Sequential 104.63 Uncached Write 182.67 112.16 MB/sec [4K blocks] Uncached Write 119.48 67.60 MB/sec [256K blocks] Uncached Read 49.08 14.36 MB/sec [4K blocks] Uncached Read 249.15 125.22 MB/sec [256K blocks] Random 458.33 Uncached Write 769.50 81.46 MB/sec [4K blocks] Uncached Write 204.17 65.36 MB/sec [256K blocks] Uncached Read 1194.49 8.46 MB/sec [4K blocks] Uncached Read 590.77 109.62 MB/sec [256K blocks] What is going on? Does anyone have an idea why my read performance dropped so badly? It used to be around 190-200 MB/sec. I know that SSDs degrade over time, but I thought that was only related to write performance. I have the 120Gb version and 28Gb free space.