I today tried to make performance test on network, and it wasn't so favourable - I thought that with 60sec blocks, it will get at least 1 confirmation in faster time, than 10min.
I have set one time minimal fee, second time it was the highest fee (1XCN), and it was the same, I waited 8-10 min to get 1 conf, rest confirmation were faster, but 10 min for 1 conf, with empty blockchain is a little disappointing
Slimcoin is processing faster transactions, which was strange for me, because it has slower block times (90 sec).
Also wallet is quite memory hungry - on my computers it consumes 800-900mb of ram, in comparison to 600mb consumed by Slimcoin node, and 200mb by Peercoin node (all fully synchronized).
Confirmation time depends on hashrate, difficulty and luck.
In average, shorter block time will always be faster.
Also what is important and would be interesting to test is tx throughput.