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I use iD regularly. It doesn't seem slow to me.

My connection is ~1Mbps, so getting the bing aerial images can take a few seconds, but it doesn't really slow my editing down.

You could try the JOSM editor[1], but iD is about as lightweight as it gets, so I am not sure if it would be much better. For what its worth, I use iD regularly without performance issues, but YMMV on older machines. Unfortunately, vector rendering and editing will tend to push browsers to their limit. This may be alleviated somewhat by the use of WebGL in coming years.

[1] https://josm.openstreetmap.de/

iD lightweight? It has trouble rendering a good block of houses when there is a lot of data whereas josm only gets into trouble rendering a small city or so of equally dense data.

You can open an issue here with details about where this occurs and your browser/machine details: https://github.com/openstreetmap/iD

Or send them to me and I will enter the issue.. I'm a collaborator on that project.

Yeah, iD can be slow. If you're just adding roads, the Potlatch 2 editor (available in the dropdown menu next to the edit button) is less polished, but perfectly adequate, and much faster.