Tag Archives: CloudFlare

More detailed CloudFlare analysis

Following my last post about CloudFlare, I ran some further benchmarks in response to the feedback from their team. Here’s the summary:

  • CloudFlare only combines our Javascript, not our CSS files, despite what it said on the tin (the site has been updated, when we signed it said JS & CSS)
  • This only happens on some user agents on some operating systems, CloudFlare will not give me a list of user agents.
  • On browsers where this is enabled, we see a marked improvement, where it’s not, we see no gain or a small loss.


I ran two sets of tests (using only browsers where RocketLoader is enabled).

Graph showing marked improvement with cloudflare on

Second graph showing marked improvement with cloudflare on


We probably won’t implement CloudFlare across all our sites. I might still experiment on one of our higher traffic sites now that we’re running boomerang and gathering real user data to compare. However, the black box nature of CloudFlare fundamentally leaves me feeling uneasy.

The product appears to be in beta, which wasn’t clear when we signed up. I thought it was a polished product ready for production use. But much of the support chat is about RocketLoader being in beta, no list of user agents at this time, etc.

Bottom line, CloudFlare hasn’t done what I expected. I’ll test mod_pagespeed and we’ll probably go with that, pending any major roadblocks.

CloudFlare slowed down our site

I deployed CloudFlare onto one of our sites today. I wanted to see hands on exactly how it works. I ran a simple benchmark. I ran 3 test 4 times each. The three tests were all from the same location, at 3 different network speeds. I ran the test 4 times, once in each configuration. I had CloudFlare enabled and disabled, and static assets coming from 3 domains or 1 domain. Here’s the results:

In every case, with CloudFlare was slower than without. Every single comparison, I ran the numbers. Some comparisons were very close, 0.02 or 0.03 seconds in it. But CloudFlare did not come out ahead one single time.

It could be a network issue. Maybe the test server (WebPageTest.org / Gloucester) is very close to our server and far from the CloudFlare servers. But even so, I’d have expected some performance gain from all the “magic” CloudFlare is supposed to do.

I’ll update with further tests. I’m also going to email CloudFlare and ask for their comments. I’ll post anything salient here.

[ Update: I’ve published some further test results here. ]