Script initiators on React sites

Sites with script-injected scripts script initiator type have a good INP most often: 95%, against 95% of all React sites. Sites with other script initiators script initiators have it least often, at 95%.

Sites with other script initiators script initiator type have a good LCP most often: 91%, against 85% of all React sites. Sites with parser-initiated scripts script initiators have it least often, at 85%.

Parser-initiated scripts is the most used: 99.6% of React sites. Script-injected scripts is 95.1% of React sites.

Wix sets the script initiator type to script-injected scripts on 100% of its sites, and 97% of Wix sites have a good INP, against 95% of all sites. WordPress sets the script initiator type to inline scripts on 100% of its sites, and 98% of WordPress sites have a good INP.

Wix sets the script initiator type to script-injected scripts on 100% of its sites, and 94% of Wix sites have a good LCP, against 85% of all sites. WordPress sets the script initiator type to inline scripts on 100% of its sites, and 61% of WordPress sites have a good LCP.

PlatformScript initiator type on its sitesGood INP

All React sites 9,570 sitesHTML parser (<script src>) 100%Inline <script> execution 100%Script-injected (tag managers / loaders) 95%Other initiators (workers / preloads) 72%95%

WordPress 2,342 sitesInline <script> execution 100%HTML parser (<script src>) 99%Script-injected (tag managers / loaders) 88%Other initiators (workers / preloads) 13%98%

Wix 5,824 sitesOther initiators (workers / preloads) 100%HTML parser (<script src>) 100%Inline <script> execution 100%Script-injected (tag managers / loaders) 100%97%

HTML parser (<script src>) Inline <script> execution Script-injected (tag managers / loaders) Other initiators (workers / preloads)

Does the platform explain the script initiator type difference?

On Wix, 97% of sites with script-injected scripts script initiator type have a good INP, against 97% of Wix sites with parser-initiated scripts. Within Wix, sites with script-injected scripts and parser-initiated scripts have a good INP about equally often. On WordPress, 98% of sites with script-injected scripts script initiator type have a good INP, against 98% of WordPress sites with parser-initiated scripts. Within WordPress, sites with script-injected scripts and parser-initiated scripts have a good INP about equally often.

On Wix, 94% of sites with other script initiators script initiator type have a good LCP, against 94% of Wix sites with parser-initiated scripts. Within Wix, sites with other script initiators and parser-initiated scripts have a good LCP about equally often. On WordPress, 50% of sites with other script initiators script initiator type have a good LCP, against 61% of WordPress sites with parser-initiated scripts. Within WordPress, sites with other script initiators have a good LCP less often.

Parser-discovered scripts versus cascading script-injected chains

When scripts are declared in HTML (99.6% of sites, 9,536), the browser preload scanner discovers them immediately (95% good INP, 80ms median). On 95.1% of sites (9,098), scripts are dynamically injected by other scripts such as Google Tag Manager or loader snippets (95% good INP, 80ms median), while 71.6% (6,853) trigger scripts via other initiators (95% good INP, 77ms median).