High resolution (retina) images vs load time
-
I have an ecommerce website and have a product slider with 3 images.
Currently, I serve them at the native size when viewed on a desktop browser (374x374).
I would like to serve them using retina image quality (748px).
However how will this affect my ranking due to load time?
Does Google take into account image load times even though these are done asynchronously? Also as its a slider, its only the first image which needs to load. Do the other images contribute at all to the page load time?
-
"Large pictures tend to be bad for user experience."
I disagree. I think what you mean is slower loading is bad for the user experience. Higher quality pictures are better for the user experience.
I've been looking into deferring loading of the additional slider images. That should definitely improve load time as all the bandwidth can be used to download the first slider image.
Also the first slider image if you use a progressive format should show something quickly and then improve over time.
-
You also have to keep in mind that users will access your site from mobile devices and that the larger the page the longer it takes to load fully. You may lose some people during the time it takes to load the page. My website used to have a slider with three images. i removed the slider and replaced it with one static image. Large pictures tend to be bad for user experience.
-
Hey Dwayne
They are big images but from experience I have never seen a meaningful impact from these kind of changes (in around 15 years). Maybe work on optimising the images themselves as best as possible to bring the overall size down as much as possible. Sure, if your site is a slow loading nightmare and this is just the final straw then it may be an issue but by the sounds of it you are already taking that into consideration and your site is well hosted and performs better than most of everything else out there.
But, as ever in this game, my advice would be to be aware of possible implications, weigh up the pros and cons and then test extensively. If you see an impact in your loading time and search results (and more importantly in user interaction, bounce etc) after changing this one factor then you know you can roll it back.
Hope that helps
Marcus
-
Hi,
Its not that small a change...the size of each image will quadruple from around 10kb to 40kb. As there are three images thats 90kb more data. Which is around 20% of the total page size.
That's interesting what you mention about the first byte load time. I would have thought that was overly simple and would definitely have assumed Google would actually be more concerned with how long it takes for the page "to load" (e.g. using their pagespeed metrics).
I've optimized my site extensively and have pagespeed score of 95% and I use the amazon AWS servers.
I agree with your idea about doing what's right for my users. But if Google includes the image load time then my site will rank poorly and then I won't have any users!
In summary, I think what this question really comes down to is how does Google calculate page load times and does this include image load time and does it include load time for all images (even ones which aren't being rendered in the slider).
Thanks,
Dwayne
-
Hey
I think this is such a small issue overall that you should not worry about a slight increase in image sizes damaging your SEO (assuming everything else is in place).
I would ask myself the questions:
- Is this better for my site users?
- does the seriously impact load times (and therefore usability / user experience)?
If you believe it creates a better experience and does not impact loading times in a meaningful way then go for it and don't worry about a likely negligible impact on loading times.
A few things I would do:
- test average loading times with a tool like pingdom: http://tools.pingdom.com/fpt/
- replace your images and test again
- look at other areas where you can speed up loading times
- make sure your hosting does not suck
For reference there was a post here a while back re the whole loading times / SEO angle that determined it was time to first byte (response time) rather than total loading time that had the impact - this would make total loading time academic from a pure SEO perspective but... it's really not about SEO, it's about your site users and whether this makes things better (improved images) or worse (slow loading) for them.
Seriously - don't worry about this small change too much from an SEO perspective. Use it as an excuse to improve loading time as that is a good exercise for lots of reasons but go with what is right for your users.
Hope that helps
MarcusRef
http://moz.com/blog/how-website-speed-actually-impacts-search-rankinghttp://moz.com/blog/improving-search-rank-by-optimizing-your-time-to-first-byte
Got a burning SEO question?
Subscribe to Moz Pro to gain full access to Q&A, answer questions, and ask your own.
Browse Questions
Explore more categories
-
Moz Tools
Chat with the community about the Moz tools.
-
SEO Tactics
Discuss the SEO process with fellow marketers
-
Community
Discuss industry events, jobs, and news!
-
Digital Marketing
Chat about tactics outside of SEO
-
Research & Trends
Dive into research and trends in the search industry.
-
Support
Connect on product support and feature requests.
Related Questions
-
Google Indexing Request - Typical Time to Complete?
In Google Search Console, when you request the (re) indexing of a fetched page, what's the average amount of time it takes to re-index and does it vary that much from site to site or are manual re-index request put in a queue and served on a first come - first serve basis despite the site characteristics like domain/page authority?
Intermediate & Advanced SEO | | SEO18050 -
Sub-domain vs Root domain
I have recently taken over a website (website A) that has a domain authority of 33/100 and is linked to from 39 root domains. I have not yet selected any keywords to target so am currently unsure of ranking positions. However, website A is for a division of a company that has its own separate website (website B) which has a domain authority of 58/100 and over 1000 legitimate linking root domains. I have the option of moving website A to a sub-domain of website B. I also have the option of having website B provide a followed link to website A. So, my question is, for SEO purposes, is my website better off remaining on its own existing domain or is it likely to rank higher as a sub-domain of website B? I am sure there are pros and cons for both options but some opinions would be much appreciated.
Intermediate & Advanced SEO | | BallyhooLtd0 -
How many times will Google read a page?
Hello! Do you know if Google reads a page more than once? We want to include a very robust menu that has a lot of links, so we were thinking about coding a very simple page that loads first and immediately loading the other code that has all the links thinking that perhaps Google will only read the first version but won't read it the second time with all the links. Do you know if we will get penalized? I'm not sure if I got the idea across, let me know if I need to expand more. Thanks,
Intermediate & Advanced SEO | | alinaalvarez0 -
Google Cookies - Organic vs PPC visitors
I am not a developer - I am researching this for our team, so please, be gentle... I am also not quite sure how to ask this question. We want to serve up custom pages for visitors from Google organic. We aren't doing anything underhanded - the pages will have very small differences that will not affect our rankings and won't land us in Google jail. When a Google visitor hits one of our pages, what specific piece of data are we looking for to determine: a. It's a Google visitor b. He/she came from organic results. I need to tell our developers to look for something that triggers the custom page. It's the same data that Google Analytics uses to trigger the appropriate visitor type. Please pardon my naivete.
Intermediate & Advanced SEO | | AMHC0 -
Is there any ranking benefit to buying and redirecting high PageRank domains?
Hello, I'm interested in learning how to assume ownership of a site without Google resetting the PageRank and the links back to zero. I've read that buying sites is one of the most powerful SEO "shortcuts" you can employ, but can be tricky. I've heard that, unfortunately, buying an existing domain and 301 redirecting for SEO credit is not that simple. When the WHOIS registration information on the newly purchased domain is updated to reflect its transfer to you, the new owner, that domain will almost immediately be reset by Google to a PageRank=0. That's the standard practice when a domain changes hands. Since Google is a domain registrar, obviously, change of ownership information is readily available for their use in factoring it into their algorithms. If you decide to 301 redirect the new domain to another domain you already own, you will get credit for the site's current incoming link profile, at least in the short-term. However, this purchased domain will eventually reset to PR=0 (usually during the next PageRank update) AND you will then get no credit for all of those links post-transfer. What is your experience with buying and redirecting domains?
Intermediate & Advanced SEO | | Choice0 -
Stop Google crawling a site at set times
Hi All I know I can use robots.txt to block Google from pages on my site but is there a way to stop Google crawling my site at set times of the day? Or to request that they crawl at other times? Thanks Sean
Intermediate & Advanced SEO | | ske110 -
Sub Domains vs. Persistent URLs
I've always been under the assumption that when building a micro-site it was better to use a true path (e.g. yourcompany.com/microsite) URL as opposed to a sub domain (microsite.yourcompany.com) from an SEO perspective. Can you still generate significant SEO gains from a sub domain if you were forced to use it providing the primary (e.g. yourcompany.com) had a lot of link clout/authority? Meaning, if I had to go the sub domain route would it be the end of the world?
Intermediate & Advanced SEO | | VERBInteractive0 -
Very basic - domain authority vs page authority
what does that mean and how is that information valuable? thank you
Intermediate & Advanced SEO | | thirsty31