>   have you compared the performance when switching from HDD to SSD drive ?
>

For DevMode I can't give any numbers but IMHO it feels faster to reload the 
app in DevMode. But don't expect a large difference.

For compiling an app to JavaScript using the GWT compiler you do not gain 
that much from an SSD. Just compiled one of the larger apps and it has taken

Workspace + tmp folders on HDD: ~270 seconds
Workspace + tmp folders on SSD: ~260 seconds
Workspace + tmp folders on RamDisk: ~245 seconds (does not include time to 
copy things into ram disk)

So its not a big difference. 

During compilation the most benefit you get is when you can compile all 
your permutations at the same time. In the above example I used 
-localWorkers 4 on a Quad Core CPU with hyper threading. Increasing 
localWorkers to 8 to fully use hyper threading and get a constant 100% 
workload on each core/virtual core the time dropped to ~250 seconds in case 
of HDD. So make sure your build machine uses all cpu power available and 
then use distributed builds on multiple build machines if you have a large 
number of permutations.

https://code.google.com/p/google-web-toolkit/wiki/DistributedBuilds

-- J.

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