math.SE is experiencing a much bigger load of questions than it used to
I think the solution is specialisation. In particular, just as usenet used to have separate groups for statistics, geometry, algebra etc ... I think the general math.stackexchange.com branch is far too general, that it is handling vastly too many postings, and that it should be subdivided into more specialised groups such as:
stats.stackexchange.com (which already exists) topology.stackexchange.com algebra.stackechange.com numbertheory.stackexchange.com ... The use of tags for things like probability and statistics and random variables and pdf etc etc etc ... does not alter the fact that these subjects belong in their own separate group. And if that group already exists (stats??) ... then those postings should not be posted here.