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The "Preview" is a killer feature. You need to make it more responsive though - currently (probably due to server load) there's a lot of lag. However, if you want to develop this into a full fledged project it should "just work" without waiting for some time for the preview to load. This includes the errors which you load in the Tex editor too. Both the instant error and preview features are great but you've somehow got to make it scale.

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Creator here...

Thanks! The current load on the servers is a factor in the current delays. I've also made some progress on reducing the render times, but unfortunately that did not come soon enough for the current traffic spike. Watch this space...

I've done quite a bit of work getting a scalable cloud LaTeX compiler set up (http://clsi.scribtex.com). Send me an email at james@scribtex.com if you'd like to chat about some of the issues that you might be facing. LaTeX is surprisingly good at running quickly and efficiently once you tweak it a bit!

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