From what I remember, I was rarely able to stay online for a whole speed vote chess game. However, in some games cheating was so obvious that it made no sense to stay up, waste time, and get beaten by engines anyway. Personally I don't believe that SVCL 5 will be clean, unless the participating teams are chosen very carefully and super admins delete cheaters from their teams (which rarely happens - who would kick out a "strong" player...)
Cheating in "speed" chess
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The Alan Tudor run groups which won and was highly influential in last few years had a large number of eventually banned players partcipating, including himself. His main group, BurningPawns, especially were able to win large number of games by being orgainised to have a Houdini user in every time zone. They were able to beat teams with only a few Houdini users by playing dull, sound chess, and eventually picking off the opponent when reached a time zone were moves were being played by human. (Alternatively in one game reviewed, the one opponent using Houdini fell asleep after many moves). The strongest human player regularly participating is now IM Kacparow. He is a young player who you would think would be ideal player for making fast decisions in this format. In fact though the team he participated with almost always lost against teams like Burning pawns.
So afraid the idea that cheating doesn't occur in these "fast" games is ridiculus. The fact is the tactical accuracy of the teams with best results was very high. It is even less plausible, compared to regular vote chess, that this would be acheived by club player strength players honestly when under stress to make decisions in 9 minutes.