On Sat, 18 Aug 2018, Daniel Jeliński via curl-library wrote:
I don't believe encryption is to blame here, at least not on curl side. I was able to upload 40 MB/s over https on plain 7.60 with 4MB socket buffer.
Encryption takes more CPU or hardware to get the job done so if you're CPU bound and/or have huge bandwidth then encrypted transfers will of course be slower.
With the same linux machine as I ran the previous tests, but this time against an nginx on localhost:
- 7.61.0 $ time curl -sT 4GB -k https://localhost/sample.cgi 5.975s - 7.61.1-DEV (with 64KB upload buffer) 5.128s (780031201 bytes/sec)Uploading over plain HTTP took 1.281 seconds with this buffer size (pretty much exactly 4 times faster). But also, uploading to localhost means this test both encrypts and decrypts on the same CPU.
As I showed before, if I upload HTTPS to my web site over a gigabit connection I can saturate it; 100MB/sec. On a six years old desktop PC.
-- / daniel.haxx.se
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