Speed hacks seem to be dwindling, but people intentionally causing lag seems to be on the rise. This is all anecdotal of course, but I haven't seen suspiciously fast people much at all lately, yet I have seen quite a few occurrences of lag happening at very convenient times for the other team. In one case I was able to verify it with several folks in the ops group that we had lag right as someone went for a node.
Yeah this one is tough, because in all honesty, the server latency of late has been shoddy at best. Not sure what happened stability wise in this game, but the servers have gotten worse somehow (latency/studdering). Not gonna call h4xxors on lag switchers and what not, but it seems to be the norm no matter what time of day.