Practical guide to predicting latency effects?

Eric Tykwinski eric-list at
Wed Apr 8 22:45:48 UTC 2020

The only informal paper I remember is Stuart Cheshire’s It’s the latency, stupid… <>

Given it’s from the dialup days, but latency is still the same just a lot lower.

I would thing I would recommend now is checking out SRE docs as well for application latency it's not network related, but does affect performance. <>


Eric Tykwinski
TrueNet, Inc.
P: 610-429-8300

> On Apr 8, 2020, at 6:36 PM, Jakob Heitz (jheitz) via NANOG <nanog at> wrote:
> My data point:
> I'm working from home. My computer is connected through company VPN, over wifi to Comcast.
> Comcast speed test says 18mS.
> I use VNC and Webex with voice and video through the computer.
> VNC response time and voice delay is not noticeable.
> Regards,
> Jakob.
> -----Original Message-----
> Date: Tue, 7 Apr 2020 22:52:18 +0000
> From: Adam Thompson <athompson at>
> I’m looking for a practical guide – i.e. specifically NOT an academic paper, thanks anyway – to predicting the effect of increased (or decreased) latency on my user’s applications.
> Specifically, I want to estimate how much improvement there will be in {bandwidth, application XYZ responsiveness, protocol ABC goodput, whatever} if I decrease the RTT between the user and the server by 10msec, or by 20msec, or by 40msec.
> My googling has come up with lots of research articles discussing theoretical frameworks for figuring this out, but nothing concrete in terms of a calculator or even a rule-of-thumb.
> Ultimately, this goes into MY calculator – we have the usual north-american duopoly on last-mile consumer internet here; I’m connected directly to only one of the two.  There’s a cost $X to improve connectivity so I’m peered with both, how do I tell if it will be worthwhile?
> Anyone got anything at all that might help me?
> Thanks in advance,
> -Adam
> Adam Thompson
> Consultant, Infrastructure Services
> 100 - 135 Innovation Drive
> Winnipeg, MB, R3T 6A8
> (204) 977-6824 or 1-800-430-6404 (MB only)
> athompson at<mailto:athompson at>

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