The resource was preloaded using link preload but not used within a few seconds

Just try to disable “HTTP/2 push” under the Minify section of W3 Total Cache.

Most probably your apache server (or whatever web server you are using) does not support http2. The browser understands that, and it’s trying to tell you that the preload is not worth it.

More about the difference between http1.1 and http2, you can find here.

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