For formats like deflate, decompression time doesn't generally depend on compressed size. (zstd is similar, though memory use can depend on the compression leve

For formats like deflate, decompression time doesn't generally depend on compressed size. (zstd is similar, though memory use can depend on the compression level used). This means an optimization like this is virtually guaranteed to be a net positive on the receiving end, since you always save a bit of time/energy when downloading a smaller compressed file.