Title: VPI behavior
Last modified: March 1, 2026

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# VPI behavior

 *  Resolved [goldensw](https://wordpress.org/support/users/goldensw/)
 * (@goldensw)
 * [1 month, 1 week ago](https://wordpress.org/support/topic/vpi-behavior/)
 * I plan to set up VPI on a news site with a responsive theme (not AMP, no separate
   mobile theme) running on LiteSpeed Enterprise.
   According to what I was able to
   find: VPI analyzes pages at 1300×900 (desktop) and 480×800 (mobile) and that 
   the mobile VPI requires Cache Mobile to be ON, otherwise it is ignored.My question:
   with a responsive theme and Cache Mobile OFF, does VPI generate and apply only
   the desktop viewport list to all visitors (including mobile)? Or does it still
   detect mobile viewport images and apply them correctly even without Cache Mobile?
   On a responsive news site, above-the-fold content differs significantly between
   desktop (article + sidebar thumbnails) and mobile (article only, sidebar stacked
   below). If VPI only uses the desktop list for mobile visitors, it would exclude
   unnecessary sidebar images from lazy load on mobile… not ideal.Want to confirm
   before I consider enabling Cache Mobile solely for proper VPI functionality.

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Plugin Support [qtwrk](https://wordpress.org/support/users/qtwrk/)
 * (@qtwrk)
 * [1 month, 1 week ago](https://wordpress.org/support/topic/vpi-behavior/#post-18837653)
 * I saw your question in Slack , then it is gone after I read the code to reply
   🙂
 * but here is the answers : yes, it does require cache mobile to enabled , in order
   to prepare 2 sets of VPI , one for desktop , one for mobile.
 *  Thread Starter [goldensw](https://wordpress.org/support/users/goldensw/)
 * (@goldensw)
 * [1 month, 1 week ago](https://wordpress.org/support/topic/vpi-behavior/#post-18837808)
 * Sorry, wasn’t my intention to cause inconvenience…
   Thank you for the fast reply!
   Appreciate the support!
    -  This reply was modified 1 month, 1 week ago by [goldensw](https://wordpress.org/support/users/goldensw/).

Viewing 2 replies - 1 through 2 (of 2 total)

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 * 2 replies
 * 2 participants
 * Last reply from: [goldensw](https://wordpress.org/support/users/goldensw/)
 * Last activity: [1 month, 1 week ago](https://wordpress.org/support/topic/vpi-behavior/#post-18837808)
 * Status: resolved