Can't comment on these pay for sites, however this site experiences its heaviest loads typically during the October - March timeframe, so that is when you might see a slow down here.

Other peak load/slower responses usually coincide with the BBC airing " Who do you think you are" or ITV with one of its "lost relative - style" program etc

We are a free to use ( but if you can please donate ) site so we do not run any "free access" this weekend trials - I would expect those to also "clog" up the sites you mention ;-)

regards

S