Title: Question regarding alter HTML
Last modified: August 12, 2019
---
# Question regarding alter HTML
* Resolved [Amit Sonkhiya](https://wordpress.org/support/users/amitaits/)
* (@amitaits)
* [6 years, 10 months ago](https://wordpress.org/support/topic/question-regarding-alter-html/)
* Hi,
* I have seen alter HTML features but I would like to know how would the page or
performance be impacted if alter HTML is unchecked. As I am using a premium theme,
enabling this option is creating glitches with the theme’s functionality.
* Can you give me a general measure if the alter HTML isn’t checked?
* Thank you
Viewing 6 replies - 1 through 6 (of 6 total)
* Plugin Author [rosell.dk](https://wordpress.org/support/users/roselldk/)
* (@roselldk)
* [6 years, 10 months ago](https://wordpress.org/support/topic/question-regarding-alter-html/#post-11826522)
* First: Have you tried both methods of Alter HTML ? (I mean both “Replace tags
with tags, adding the webp to srcset.” and “Replace image URLs”).
* The Alter HTML feature was primarily created for those case where serving varied
image responses was a problem (ie on Nginx without access to server config or
when on CDN which cannot be set up to allow two different types on same URL).
* An extra bonus of alter HTML is that when users right-click the image and save
it to disk, it will have the correct extension. With varied image responses,
on webp-enabled browsers, there is a discrepancy between file extension and image
type.
* Performance-wise, the gain of enabling Alter HTML in “Varied image responses”
mode is insignificant and hardly measurable.
* Plugin Author [rosell.dk](https://wordpress.org/support/users/roselldk/)
* (@roselldk)
* [6 years, 10 months ago](https://wordpress.org/support/topic/question-regarding-alter-html/#post-11826523)
* marking as resolved
* Plugin Author [rosell.dk](https://wordpress.org/support/users/roselldk/)
* (@roselldk)
* [6 years, 10 months ago](https://wordpress.org/support/topic/question-regarding-alter-html/#post-11826528)
* Actually, if you are not using page caching, it will be better performance-wise
to **disable** Alter HTML as the Alter HTML feature increases the “time to first
byte” (TTFB). Especially on pages with many images on it.
* Thread Starter [Amit Sonkhiya](https://wordpress.org/support/users/amitaits/)
* (@amitaits)
* [6 years, 10 months ago](https://wordpress.org/support/topic/question-regarding-alter-html/#post-11827179)
* Hi,
* I’m using WooCommerce with a premium theme so there’re many images heavily as
well as additional jQuery.
* The “Replace Image URLs” has no catching support limitations and I will use [Litespeed](https://wordpress.org/plugins/litespeed-cache/)
plugin as the host’s cache manager works best with it. So I’ve discarded this
option.
* Else if I check to alter HTML using “Replace tags with ” then the website
gets issues with the theme functionality because of HTML structure alternation.
* So the last choice left is to don’t enable “Alter HTML” feature. In that case,
I’m wondering will this work almost equally?
* Also, in the case of “Convert on upload” unchecked, the site loading reaches
up to 1 minute for 14 webP images worth 2.75MB and no prior browser caching.
Is that normal?
* Here is the page for your kind consideration: [https://www.craftesy.com](https://www.craftesy.com).
* Thanks
- This reply was modified 6 years, 10 months ago by [Amit Sonkhiya](https://wordpress.org/support/users/amitaits/).
* Plugin Author [rosell.dk](https://wordpress.org/support/users/roselldk/)
* (@roselldk)
* [6 years, 10 months ago](https://wordpress.org/support/topic/question-regarding-alter-html/#post-11827866)
* I shall then recommend that you disable “Alter HTML”. As I said, the option does
not get you better performance, but might get you worse.
* I shall also recommend that you convert all images with Bulk convert. After the
bulk conversion, the webp’s will be delivered directly (make sure you enable “
Enable direct redirection to existing converted images?”). In addition to this,
I recommend you enable “Convert on upload”. Uploading will take a bit longer,
but it is worth it, because it prevents the situation you describe where you
have 14 unconverted images on a page.
* Thread Starter [Amit Sonkhiya](https://wordpress.org/support/users/amitaits/)
* (@amitaits)
* [6 years, 10 months ago](https://wordpress.org/support/topic/question-regarding-alter-html/#post-11828206)
* Hi,
* Disabling the “Alter HTML” is better as I made a few tests.
* Thanks
Viewing 6 replies - 1 through 6 (of 6 total)
The topic ‘Question regarding alter HTML’ is closed to new replies.
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* 6 replies
* 2 participants
* Last reply from: [Amit Sonkhiya](https://wordpress.org/support/users/amitaits/)
* Last activity: [6 years, 10 months ago](https://wordpress.org/support/topic/question-regarding-alter-html/#post-11828206)
* Status: resolved