Problem with cache

Hi,
I have been having problems with the cache on my site not working, and I have discovered that your plugin is one of two causing the issues. Having looked at the plugin files I have found this file – wp-popups-lite/src/includes/functions.php – and in it a section (pasted below);

/**
 * Clear all Cache
 * @return mixed
 * @since  2.0
 */
function wppopups_clear_caches() {

	// WP Rocket
	if ( function_exists( 'rocket_clean_domain' ) ) {
		rocket_clean_domain();
	}
	// W3 Total Cache : w3tc
	if ( function_exists( 'w3tc_pgcache_flush' ) ) {
		w3tc_pgcache_flush();
	}
	// WP Super Cache : wp-super-cache
	if ( function_exists( 'wp_cache_clear_cache' ) ) {
		wp_cache_clear_cache();
	}
	// WP Fastest Cache
	if ( function_exists( 'wpfc_clear_all_cache' ) ) {
		wpfc_clear_all_cache( true );
	}
	// WPEngine
	if ( class_exists( 'WpeCommon' ) && method_exists( 'WpeCommon', 'purge_memcached' ) ) {
		WpeCommon::purge_memcached();
		WpeCommon::purge_varnish_cache();
	}
	// SG Optimizer by Siteground
	if ( function_exists( 'sg_cachepress_purge_cache' ) ) {
		sg_cachepress_purge_cache();
	}
	// LiteSpeed
	if ( class_exists( 'LiteSpeed_Cache_API' ) && method_exists( 'LiteSpeed_Cache_API', 'purge_all' ) ) {
		LiteSpeed_Cache_API::purge_all();
	}
	// Cache Enabler
	if ( class_exists( 'Cache_Enabler' ) && method_exists( 'Cache_Enabler', 'clear_total_cache' ) ) {
		Cache_Enabler::clear_total_cache();
	}
	// Pagely
	if ( class_exists( 'PagelyCachePurge' ) && method_exists( 'PagelyCachePurge', 'purgeAll' ) ) {
		PagelyCachePurge::purgeAll();
	}
	// Autoptimize
	if ( class_exists( 'autoptimizeCache' ) && method_exists( 'autoptimizeCache', 'clearall' ) ) {
		autoptimizeCache::clearall();
	}
	//comet cache (formerly zencache)
	if ( class_exists( 'comet_cache' ) && method_exists( 'comet_cache', 'clear' ) ) {
		comet_cache::clear();
	}
	// Hummingbird Cache
	if ( class_exists( '\Hummingbird\WP_Hummingbird' ) &&
	     method_exists( '\Hummingbird\WP_Hummingbird', 'flush_cache' )
	) {
		WP_Hummingbird::flush_cache();
	}

	return true;
}

Can you tell me why this is necessary? I use your plugin extensively to present forms to users, and having the cache purged constantly is causing both the site to be slow and resource usage spikes on the server. If it is necessary I am going to have to find an alternative way of presenting forms to users, otherwise can I delete this section, or is there some code I can put in my theme functions to prevent it running? I don’t understand why it is needed, and if it isn’t why there is no option to turn this off. Please help me understand.