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hi... you can read my post "from 44-46 to 50" at the top of the forum. it has some comments on timing.
as you found out yourself - simple calculations tend to be the biggest time consumers.... and obviously there are 2 ways to cope with it:
a) improve your calculation skills
b) find ways to solve that require less calculations
for (a) you'd need to practice a lot, but do yourself a favour - practice all calculations by heart. no pencil and paper (and definitely no calculator).
there are many shortcuts in calculations. for example 37*19 should always be done: 37*20 (that's easy 740). then substruct 37 to get 703.
there are plenty of such shortcuts and methods. the more you do it by heart the easier is to find them.
for (b) it is more complicated to explain... better do it by example... but in general it is all about representation. in gmat you can almost always represent the same data in a way that requires less calculations (i.e. find algebraic ways to simplify answers). also, in many cases you only need to roughly estimate the result and not do the calculations to the end. this can save you time as well. also, try to use "plugin numbers" very cautiously. looking at this forum i think it is overused and overrated as a solving method. and it may become a time killer as it always reduce things to simple (but potentially lengthy) calculations.
in order to better help you and others i suggest that you publish "time killer" questions. i.e questions that are not hard to solve but took too much time to solve. i'm sure that someone in this forum may be able to point the shortest way to the solution.