Raymond Hettinger recently tweeted that .join() was O(n) but concats are 
O(n^2), or some other super-linear factor like that, so your speedup makes 
perfect sense.   I think you've discovered a performance bottleneck in the 
rendering system of web2py.  Shouldn't be too hard to find with a profiler. 
 I wish I had time to play with this, but I don't.   But I am very 
interested in this issue, which is why I am replying (so I can tick "Email 
updates to me :)

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