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I know that modern browsers will allow URIs with spaces in them, and I imagine that there’s some encoding/decoding going on that might not be there otherwise.
Are there any material performance impacts that can be attributed to having spaces in a URI?
As far as I know, browsers convert space to %20 so the server will not notice. In fact, in Firefox if you copy a URL that has spaces from the address bar it will be converted to %20.
Also, I think this is not worth pursuing. It would be really hard to measure the performance impact and it seems to be a really tiny part of the load anyway.
Also, the load would be on the PCs,,, not on your servers.
I (as a programmer writing code or links) would type %20 because it is safer (less likely to fail) and closer to what actually happens.