I don't think Ivan (the CCEDK/Openledger server guy) uses this forum, and I know that Openledger had some issues with latency too as they have been getting a lot of new customers lately.
I think
@ccedk @xeroc or
@svk might know what's up. I just saw your message here and was trying to help out.
I have used the web wallets too and from personal experience they can be a bit slower since the javascript that gets sent to your browser is pretty heavy. You retain your own keys in a decentralized system, so there is more that has to be transmitted. The first visit is usually the worst though, but after that, the javascript is saved in your local storage so subsequent visits have very little to send to your browser.
There is also downloadable clients here if you're interested:
http://bitshares.org/download And mobile wallets on google play and aptoide.
Hope I was at least of some help