What would cause this slowdown.

[Ray UK]

Ok, so my site has started lagging at times, so I enabled the Debug Profiler.

Luckily I caught one of the slowdowns and this is the reading.

 

 

Now what would be causing that. Would it be a bug somewhere on my site, or a VPS server configuration?

It doesn't do it every page reload, just every now and then.

I have got memcached, mod_pagespeed and Nginx running.

SQL cache is set to 2

Thanks in advance

[El Patron]

had a little  time to review, page reviewed

hosting tip, go dedicated so you are not affected by other vps with high usage.  We have had great results putting clients onto this hosting ssd/nvme with plesk.  

here some feedback that may help you DIY, but I also noted slow response from category to product but out of time for today!

also I recommend disable PS ccc .js  (probably for .css also)  why?  the following pages have different ccc file names,  so it's reloading files that were may have been fetched an cached in the browser from previous page.

category https://www.northwestecigs.uk/themes/hbecigs/assets/cache/bottom-5de16a2223.js
product https://www.northwestecigs.uk/themes/hbecigs/assets/cache/bottom-0b6e4a2223.js
 

 

JavaScript files are blocking page rendering..

• /themes/hbecigs/assets/js/aos.js.pagespeed.jm.nZnBHIaNpp.js
• /themes/hbecigs/assets/cache/bottom-5de16a2223.js
• /consent-banner/1.2.1/cb.min.js

fix: https://prestaheroes.com/products/javapro-javascript-performance-manager?variant=43306657087695

 

Images within the initial viewport are being lazy-loaded.

• https://www.northwestecigs.uk/2750-default_md/xallo-pava-horiz-ultra-pod-vape-kit.jpg.pagespeed.ic.RkgfbPZwB-.webp
• https://www.northwestecigs.uk/2080-default_md/xaspire-gotek-pro-kit.jpg.pagespeed.ic.9DGJxDSEKE.webp
• https://www.northwestecigs.uk/1567-default_md/xaspire-gotek-x-pod-kit.jpg.pagespeed.ic.JmjXNhjWmN.webp

4 3rd-party requests are blocking page rendering.

• https://fonts.googleapis.com/css2?family=Barlow+Condensed:wght@500;700&family=Playwrite+DE+Grund:[email protected]&display=swap
• https://fonts.googleapis.com/css?family=Barlow+Condensed
• https://public-assets.tagconcierge.com/consent-banner/1.2.1/styles/light.css
• https://public-assets.tagconcierge.com/consent-banner/1.2.1/cb.min.js

Edited May 1 by El Patron (see edit history)

[Daresh]

Show us the detailed module execution time breakdown.

[Ray UK]

Thank Patron,

The first thing I done was to disable PS CCC for CSS & JS and it seemed a little snappier already. but the intermittant slowdown still happens.

@Daresh, Here is the module execution times.

This first screenshot was the first product page I loaded

and this is the second product page I loaded (which took time to load)

displayFooterProduct and ps_categoryproducts are high on this second page I loaded but fine on the first.

 

[Ray UK]

So I tried reloading that second page again and those high values changed to

and

but the page loaded faster than the first time

[Daresh]

You need to grab it when the total execution time is 30s like on your first screenshot. 1112ms is quite normal.

[El Patron]

I recommend using better performance tools

https://www.webpagetest.org/  recommended by google

google inspect/performance, light house

using a vps, your result can vary from test to test depending on that server foot print load and your vps package (i.e. was favor it has)...get a dedicated server with tuned mysql config

google measures above the fold render...how long it takes for footer is less important, for example above I mentioned you are lazy loading above the fold category images...fix that...:)

from above

Images within the initial viewport are being lazy-loaded.

https://www.northwestecigs.uk/2750-default_md/xallo-pava-horiz-ultra-pod-vape-kit.jpg.pagespeed.ic.RkgfbPZwB-.webp

https://www.northwestecigs.uk/2080-default_md/xaspire-gotek-pro-kit.jpg.pagespeed.ic.9DGJxDSEKE.webp

https://www.northwestecigs.uk/1567-default_md/xaspire-gotek-x-pod-kit.jpg.pagespeed.ic.JmjXNhjWmN.webp

I have done, like many on here, loads of performance work on client shops...you have 3rd party calls, put in preconnects...your dns connect is slow, put it on cloudflare...lots of things from other tools that give you advice how to actually fix them....focus man loool

[musicmaster]

You are looking at the wrong variables. When you scroll further down in profiling mode you will see the time taken by each query. It also tells you where that query is located (you may need to scroll to the right to see it). 

This could very well be a module problem and this way you can catch it.

[SandipD]

You should take help from your vps hosting provider. They can understand your problem and can give a perfect solution to per problem. When I have any problem then I directly contact the DedicatedCore team, which helps to solve my issue effectively.

 

Edited June 9 by SandipD (see edit history)