by
lr » Tue Apr 23, 2013 11:01 pm
Hmm, if I add this up (and assume that the time is strictly proportional to bandwidth, which is saying that the 56k modem is the only bottleneck), I get for my scenario: Beta webmail 14.9 + 5.5 + 7.5 = 27.9 seconds, Squirrelmail 12.0 + 5.6 + 5.5 = 23.9 seconds. And that's even wrong, because I'm comparing 50 messages in beta mail with 15 message in squirrel mail (and in my scenario, the message was on the 3rd or 4th screen in squirrelmail). On the other hand, my scenario is not exactly comparable, because I attached a small .pdf file when sending the composed message, but that should only have added 2.5 seconds, and that adder should be constant. Your numbers clearly show that the new mail is only about 15% or so "slower" (measured by transit speed alone). Odd that we disagree so much.
If you assume that the modem actually transports 50 kBits/s (realistic), with my byte counts squirrel mail should have taken 42 seconds (actually, a little bit more because you have to pay a few roundtrips, and ping latencies on modems tend to add 200ms or so). The 24s calculated above is awfully fast. A little bit of that could be explained by packet headers being much shorter on ppp versus ethernet, and compression on the modem might explain the rest. It's at least in the ballpark. But your numbers really don't agree with my packet and byte counts showing a factor of 2-3 between Squirrel and beta, versus your 15%. It's probably not IE versus Safari, as my wife sees a large slowdown using IE too (but hasn't measured that).
I will try to find some time to further figure out what network usage pattern causes such a radical difference in my measurements. I can set up a 56K modem and reproduce your numbers too. But this will not happen soon, as it's pretty busy in the next few days (and long boring meetings in the office are not all that common, fortunately).
Well, at this point I need to apologize. So you had measurements, and they showed that the slowdown from the beta web mail is "minor" (using a sensible definition of "minor"). I do not understand why my measurement shows a much larger slowdown, and some other posters have also seen that qualitatively. Given the information you have, you did the right thing. I'm sorry to wrongly accuse you of being careless or worse. But please consider whether completely turning off all old web mail is a good idea, since there is a set of people and situations where the new one does considerably worse (either in speed, or in "user acceptance").