LiteSpeed Mobile Caching Issue

[Hannah]

My client recently told me that his Google Ads person was unhappy with the mobile site performance. I recommended that he migrate his site to a host with LiteSpeed servers so I could work with it more effectively, which he did. I’ve been working on the cache settings and every time I get the mobile performance grade up to 90+ with little or no blocking time in PageSpeed Insights, after a few hours—and with no further changes—it drops back down to the 30s and 40s. Desktop speed is great, consistently scoring in the mid to high 90s. It seems like the webp versions of images are not being served consistently to mobile, and when they’re not, other faults appear, such as the HubSpot form loading slowly (I have replaced the old form code with their current code…and this form does not appear in an incognito window/LiteSpeed Guest Mode). It’s unclear to me if this is related to BPS, but maybe that’s what’s blocking the delivery of webp images…I don’t see anything in the security log that indicates this, though. Can you help me determine whether or not BPS is preventing the optimized images from being delivered to mobile?

[AITpro Admin]

BPS does not block webp files.  If you had a webp plugin and the BPS Plugin Firewall was blocking a js file in that plugin then you would see Security Log entries for that. So probably not BPS causing this problem.  Since the problem is specific to mobile devices then yeah it is some kind of caching problem with your caching plugin.

I found this LightSpeed Cache plugin topic with the exact same problem > https://wordpress.org/support/topic/litespeed-cache-does-not-cache-my-mobile-homepage/

What the plugin author is saying you can use a crawler script to crawl your site to keep pages cached > https://docs.litespeedtech.com/lscache/litemage/crawler/#how-to-use-the-crawler-script

Another option would be to create static cached pages for mobile devices. Not sure if LightSpeed Cache offers that though.

I’ve never been able to get a good performance rating for mobile devices on Google PageSpeed Insights on any of my websites. Usually around 20-30.  Accessibility, Best Practices and SEO are in the 90’s though.

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