Some of the higher-level foreigners use "latency boosters" (specialized VPNs) to improve routing and therefore latency and turn rate when playing against Korean opponents. At least Bonyth and Eonzerg have mentioned on their streams that they do so.

There's a bunch of latency boosters on the market: MudFish, WTFast, ExitLag, LagoFast, GearUP, etc.

Perhaps you have also used a latency booster for BW?

I propose we collect latency booster / VPN-related experiences in this thread so that the community can infer
- how large an improvement in turn rate / latency, if any, can be achieved,
- which of the service providers might provide the best solution.

If you have used a latency booster, please mention at least
- Country you're playing from
- Which booster(s)
- Typical turn rate / latency (e.g. TR16 High) when playing against Korean opponents without booster
- Typical turn rate / latency (e.g. TR16 High) when playing against Korean opponents with booster

Relevant old threads:
https://tl.net/forum/brood-war/536188-mudfish-korean-vpn
https://tl.net/forum/brood-war/532728-what-vpn-do-you-guys-use