Pinned bar improvements; Performance optimizations; Timeline fixes & more.
I'd guess you've done something wrong, because with zero latency it should happen quickly. As far as I'm aware nobody else has been having that problem, but if you think it's a bug in Construct, please file an issue following all the guidelines.
I don't think it's a bug, just a lack of updates. There's little discussion about Construct's multiplayer, and all the examples we have online are very basic, but if you say it has good tools to handle this, could you give some examples? I'd like to test it; so far, the official topics and manual haven't offered much relevance. A great example is binaryData, which has been extremely helpful and proves that multiplayer can indeed be greatly improved.
The Online multiplayer in Construct tutorial series covers everything in detail. I'd also point out that support for binary data transfers is a relatively recent update to the Multiplayer feature.