Is there any difference in performance between using, say, a 2048-bit TLS cert compared to a 4096-bit one? If so, how much difference in performance could there be? If not, why use 2040- over 4096-bit TLS certs?
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1Should be slower by a factor 6 or so.– CodesInChaosCommented Mar 27, 2017 at 20:01
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@CodesInChaos Why factor of ~6?– GeremiaCommented Mar 27, 2017 at 21:19
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It is slower at asymmetric not symmetric: It is only slower at setting up the connection, not the ongoing data. If you are using very short connections, then it will make a difference, if this is for a "lot" of data, like a VPN or a video stream, then it will make little to no measurable difference.– MikePCommented Mar 27, 2017 at 23:07
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@MikeP Yeah, I'm assuming the bulk cipher etc. are all the same, the only difference being the cert's key length, so I suppose I could be more precise and asking exactly how much difference in handshaking time etc. there'd be.– GeremiaCommented Mar 27, 2017 at 23:11
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1@Geremia It's not so much time as it is processing power. A longer key will put a lower limit on the amount of connections/second you can negotiate. If you have low connection requirements, it won't matter.– Steve SetherCommented Mar 28, 2017 at 13:47
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