Andy Davies › Comments

Andy Davies
Re: How to: Create an ‘all-in-one’ WebPageTest Private Instance - http://andydavies.me/blog...
"By test machine do you mean server or test agent? There is an experimental node.js agent that can drive Chrome on linux but that's obviously a bit limited if you want the other browsers." - Andy Davies
Andy Davies
Re: How to: Create an ‘all-in-one’ WebPageTest Private Instance - http://andydavies.me/blog...
"I think that's the default you get when Apache has no config, so I'd look at your Apache config again." - Andy Davies
Andy Davies
Re: Implementing Sparkicons - http://andydavies.me/blog...
"You could do that with CSS attribute selectors e.g. a[href$=".png"]:after { content: url(url-of-relevant-icon) } but you'd need to do it for each file type, and then will be some issues with inferring the content from the filetype." - Andy Davies
Andy Davies
Re: The pros and cons of using R packages for teaching - http://timotheepoisot.fr/2013...
"I put language in quotes as I meant more than just the basic syntax of R (which is pretty simple really), I guess what I mean is the whole ecosystem, there are definitely packages and methods where the API could have been better designed. I've got a few R books but thanks for the list will check it out." - Andy Davies
Andy Davies
Re: The pros and cons of using R packages for teaching - http://timotheepoisot.fr/2013...
"I'd describe myself as an R dabbler - I specialise in web performance but increasingly want to apply statistical approaches to the data I generate - and I find R one of the most powerful and frustrating toolsets around. Suspect some of my issues are down to the 'language' itself, some down to the documentation available for it and some due to my limited stats knowledge. Often I know what I want to achieve but finding the appropriate way of doing it in R can be time consuming, for instance the other day I wanted to reshape some data and it took me ages to find I needed to use melt and cast. There's a real opportunity for some one to write a guide to using R in everyday stats, rather than just being a stats tool written by statisticians for statisticians (aware that might seem harsh) Often wonder whether I would feel more comfortable doing my stats in Python as I write code in it too." - Andy Davies
Andy Davies
Re: UK liable for Scotland’s banks in a future crisis - http://www.telegraph.co.uk/finance...
"Doesn't the M8 count? Also my understanding are the Scottish motorways are the responsibility of the Edinburgh administration, so it's down to them to solve - isn't that what devolution is about?" - Andy Davies
Andy Davies
Re: Adding iOS agents to a WebPagetest Instance - Andy Davies - http://andydavies.me/blog...
"I've added the following to createWebView: urlCache = [[NSURLCache alloc] initWithMemoryCapacity:4*1024*1024 diskCapacity:10*1024*1024 diskPath:nil]; [NSURLCache setSharedURLCache:urlCache]; and then I release it in destroyWebView [urlCache release]; urlCache = nil; I've still got some funny timings in the repeat view though" - Andy Davies
Andy Davies
Re: Adding iOS agents to a WebPagetest Instance - Andy Davies - http://andydavies.me/blog...
"Hi Mick, Yes, I've got it to work with xcode 5 - there are still lots of warnings (partly due to the undocumented APIs it uses) I've shared the repository that I keep my copy in so you can look at that. You can access the settings via the setting menu in iOS Andy" - Andy Davies
Andy Davies
Re: A proxy for first paint and why I love Velocity - http://www.lognormal.com/blog...
"Do we know what actually gets painted during first paint e.g. are browsers just clearing the screen?" - Andy Davies
Andy Davies
Re: Case Study: The Up Group Website Performance | Always Twisted. Front-End Development. - http://alwaystwisted.com/post...
"Keep-alive is different from caching… keep-alive allows a browser to re-use TCP connections so once the first size connections are set up they can be reused, removing the overhead of creating new connections for further requests. Caching is set using the HTTP Cache-Control directive and determines how long browsers and other caches can store a response e.g. CSS file before checking back with the origin server." - Andy Davies
Andy Davies
Re: Test Your App Under Slow Network Speeds - http://juristr.com/blog...
"It's a reasonable price and a good tool for watching HTTP traffic" - Andy Davies
Andy Davies
Re: Test Your App Under Slow Network Speeds - http://juristr.com/blog...
"On thing to watch out for with proxies is they may alter connection behaviour (there's a low latency connection between the app and the proxy), I've seen it mentioned by @souders but not researched it myself I tend to use DummyNet to shape bandwidth when I'm testing" - Andy Davies
Andy Davies
Re: New Runtime Interpreter in Android 4.4? - https://www.xda-developers.com/...
"I guess OSX / Linux are preferred OS but there must be Windows boxes as people need to work on Chrome for Windows etc. I also know at least one Googler who runs a Windows laptop as his daily machine." - Andy Davies
Andy Davies
Re: What Are People Doing On All Those Cheap Tablets? - http://www.avc.com/a_vc...
"Other people have reported they don't see the same behaviour too. In browsers it at least still has the same pages loaded (if not in the same state) but in many other apps they restart from scratch. iOS6 had similar behaviour to a limited degree - if I was completing a webform e.g. replying in a forum, it wasn't unusual to lose the contents of the form if I switched apps or even tabs sometimes. I've largely got used to iOS7's behaviour on iPad 2 but still find it a little frustrating, biggest issue I have with iOS is the lack of interaction between apps (Android style intents) and lack of swipe like keyboard. I see the iPad being replaced by a Nexus 7 sooner or later - there's a few apps I'll miss but not that many I hope!" - Andy Davies
Andy Davies
Re: What Are People Doing On All Those Cheap Tablets? - http://www.avc.com/a_vc...
"I've got an iPad 2 and switching apps in iOS7 is quite a painful experience as generally the one I switch to is reloaded from scratch" - Andy Davies
Andy Davies
Re: How the Browser Pre-loader Makes Pages Load Faster - http://andydavies.me/blog...
"Yup that it is one of the potential problems with postpone, there's also an potential performance issue of a visitor on 3G whose radio goes to sleep and so the delay of radio waking again. I don't think we know which is the best way of handling situations like this yet e.g. should we not use postpone and rely on a custom NavigationController to prioritise content for some apps instead?" - Andy Davies
Andy Davies
"Nice idea, rendering performance needs some polish as it's quite janky / CPU heavy (Chrome's timeline is your friend)" - Andy Davies
Andy Davies
"Appears to be broken so can't judge it" - Andy Davies
Andy Davies
"The more people who get to learn the power of R and statistics the better so powerful, easy to use R tools FTW!" - Andy Davies
Andy Davies
"Nice idea, searches don't appear to work though so can't really judge it" - Andy Davies
Andy Davies
Re: How the Browser Pre-loader Makes Pages Load Faster - http://andydavies.me/blog...
"There was a fair bit of discussion about the attribute names, if you want to take it further the W3C Performance Working Group (http://www.w3.org/2010/webperf... is the place to go." - Andy Davies
Andy Davies
Re: How the Browser Pre-loader Makes Pages Load Faster - http://andydavies.me/blog...
"My reading of the parallel scripts and parallel script/stylesheet test from Browserscope tests suggests it doesn't - http://www.browserscope.org/?c... Well aware of your involvement in IE so I'll re-test it though." - Andy Davies
Andy Davies
Re: Adding iOS agents to a WebPagetest Instance - Andy Davies - http://andydavies.me/blog...
"I changed the version I run to use it's own (non-shared) cache - I'll post a changeset for it" - Andy Davies
Andy Davies
Re: On The Future of iOS and Android - http://stevecheney.com/on-the-...
"Nope, no bitter at all, just a bit frustrated with the lack of progress that iOS has made in places." - Andy Davies
Andy Davies
Re: On The Future of iOS and Android - http://stevecheney.com/on-the-...
"I use both iOS and Android on a daily basis and in many ways Apple aren't ahead though. The crappy iOS keyboard (compared to swype) and the complete lack of integration between apps are glaring holes in the iOS ecosystem" - Andy Davies
Andy Davies
Re: Tesla Reports Another Profitable Quarter (Depending on Your Math), Musk Admits to Shooting Self In Foot - http://www.wired.com/autopia...
"What GAAP does it make a company match up the revenue with the obligation to the customer. I used to work for a company that sold multi-year subscriptions - if we sold a three year subscription we could only recognise a third of the revenue each year. Makes complete sense as a way of accounting to me." - Andy Davies
Andy Davies
Re: On Mobile, Data URIs are 6x Slower than Source Linking (New Research) - http://www.mobify.com/blog...
"Interesting results and a few questions… Be good if we could get someone to explain the stages a browser goes through to translate a dataURI to an image and where the 'bottlenecks' - suspect it's partly CPU, partly memory. - What RUM tool did you use, and how is it actually measuring in the times (as only Android 4.x supports Navigation Timing)? So are you just hooking onload for the images? - What format were the images? - Did you do any tests with smaller images compared against a sprite? - Have you done any tests with fonts - several of the font foundries are packaging some fonts as dataURIs?" - Andy Davies
Andy Davies
Re: Setting up SSL on nginx for performance and security - http://www.lognormal.com/blog...
"No, they install the intermediate certificate separately so the chain is complete but involves extra roundtrips to resolve. Both SSL Labs and the x509 labs testers will show this, but only x509 (https://sslcheck.x509labs.com/... shows how to combine the certs." - Andy Davies
Andy Davies
Re: Setting up SSL on nginx for performance and security - http://www.lognormal.com/blog...
"it's amazing how many commercial sites don't combined the site and intermediate certificates (step 3)" - Andy Davies
Andy Davies
Re: HTTP Archive + BigQuery = Web Performance Answers - http://www.igvita.com/2013...
"To get the first example to work I had to add httparchive: before runs i.e. FROM [httparchive:runs.2013_06_01_pages]" - Andy Davies
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