Increase the page speed request timeout from 30 seconds to 90 seconds.

increase-timeout.php

<?php
add_filter( 'http_request_args', 'prefix_http_request_args', 10, 2 );

function prefix_http_request_args( $parsed_args, $url ) {
    if ( false === strpos( $url, 'runPagespeed' ) ) {
        return $parsed_args;
    }

    // Set timeout with 90 seconds.
    $parsed_args['timeout'] = 90;

    return $parsed_args;
}