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I'd be guessing that open water is at least ~10% slower (assuming not hideous conditions).
I find the opposite. I think I'm faster in OW with a wetsuit - my PB for 3.8km was in a standalone lake swim and was (IIRC) just under 10% faster than I could do for a timed effort in the pool at around the same time. Completely anecdotally, I'd attribute the difference to the wetsuit but there may also have been some more drafting in the lake swim when compared to the pool but I doubt it would have made that much difference.
I also did a non-wetsuit lake swim around the same time and in that race I was in the region of 25% slower - although I'd put most of that down to the hypothermia rather than the lack of buoyancy.
In other news, I think I can now feel when I'm doing my new technique 'right', and when I'm getting it wrong... however my CSS pace is now about 10sec/100m slower than it was before. I'm hoping that things will improve quickly as the new technique beds in, but I was feeling a bit despondent yesterday when a load of guys from the university swim club joined my lane...
2600m in 55mins this morning, so that would be 1h20 for a 3.8km swim (at the same speed). For the slvlss brigade, how (in general) do pool times sans-wetsuit compare with open water swims in a wetsuit? I'd be guessing that open water is at least ~10% slower (assuming not hideous conditions).
Happy with that anyway, and it can only get better as I get fitter/lighter and improve my technique (no swimming teachers at the pool this morning, will hopefully find someone when I go back later with my daughter).
Also looking at the Wimbledon Windmilers site as they do swimming coaching somewhat nearby (but Monday night's aren't great for me). It's starting to get a little #srsbzns.