Title: Continuous flush_rewrite_rules() causing performance issues Last modified: October 10, 2025 --- # Continuous flush_rewrite_rules() causing performance issues * Resolved [Duy](https://wordpress.org/support/users/duy1412/) * (@duy1412) * [8 months ago](https://wordpress.org/support/topic/continuous-flush_rewrite_rules-causing-performance-issues/) * ```wp-block-code # Bug Report: Continuous flush_rewrite_rules() causing performance issues## Plugin Information- **Plugin Name**: WP Loyalty Rules (wp-loyalty-rules)- **Plugin Version**: Latest version (as of October 2025)- **WordPress Version**: 6.x- **WooCommerce Version**: Latest- **Related Plugin**: Premmerce Permalink Manager for WooCommerce (woo-permalink-manager)## Issue DescriptionThe plugin is causing continuous flush_rewrite_rules() calls on every request, leading to severe performance degradation and unnecessary database operations.## Root CauseIn App/Controllers/Site/MyAccount.php, the addEndPoints() method has been changed from:**Previous version (working):**php

$status = apply_filters( 'wlr_flush_rewrite_rules', false );

if ( $status ) {

flush_rewrite_rules();

}

**Current version (problematic):**php

$status = apply_filters( 'wlr_flush_rewrite_rules', true );

if ( $status ) {

flush_rewrite_rules();

}

## Impact1. **Performance**: Continuous flush operations on every request2. **Database**: Unnecessary rewrite rules regeneration3. **Cache**: Object cache gets flushed repeatedly4. **User Experience**: Slower page load times, especially on product pages5. **Plugin Conflicts**: Amplifies issues when used with Premmerce Permalink Manager for WooCommerce## Steps to Reproduce1. Install and activate wp-loyalty-rules plugin2. Install and activate Premmerce Permalink Manager for WooCommerce (optional, but amplifies the issue)3. Visit any WooCommerce product page4. Check debug logs - you'll see continuous flush operations5. Monitor server performance - CPU usage increases significantly## Debug Log Evidence

[10-Oct-2025 15:14:41 UTC] [HOOK wp_loaded] priority 10: WP_Rewrite::flush_rules @ /home/runcloud/webapps/cv-wordpress/wp-includes/class-wp-rewrite.php:1873

[10-Oct-2025 15:14:41 UTC] [REWRITE FILTER] require('wp-blog-header.php'), require_once('wp-load.php'), require_once('wp-config.php'), require_once('wp-settings.php'), do_action('wp_loaded'), WP_Hook->do_action, WP_Hook->apply_filters, WP_Rewrite->flush_rules, WP_Rewrite->refresh_rewrite_rules, WP_Rewrite->rewrite_rules, apply_filters('rewrite_rules_array')

## Suggested Fix### Option 1: Revert to previous behaviorphp

$status = apply_filters( 'wlr_flush_rewrite_rules', false );

if ( $status ) {

flush_rewrite_rules();

}

### Option 2: Add endpoint existence checkphp

public function addEndPoints() {

if ( self::$woocommerce->isBannedUser()

|| ! apply_filters( 'wlr_before_adding_menu_endpoint', true )

) {

return;

}

// Check if endpoint already exists

if (!get_option('wlr_loyalty_reward_endpoint_added')) {

$status = apply_filters( 'wlr_flush_rewrite_rules', true );

if ( $status ) {

flush_rewrite_rules();

update_option('wlr_loyalty_reward_endpoint_added', true);

}

}

add_rewrite_endpoint( 'loyalty_reward', EP_ROOT | EP_PAGES );

}

### Option 3: Only flush on plugin activationMove the flush operation to plugin activation hook instead of woocommerce_init.## Temporary WorkaroundUsers can add this filter to their theme's functions.php or a MU plugin:php

add_filter('wlr_flush_rewrite_rules', '__return_false');

## Additional Information- The issue affects all sites using the plugin- Performance impact is more noticeable on high-traffic sites- The endpoint loyalty_reward only needs to be added once, not on every request- **Plugin Conflict**: When used with Premmerce Permalink Manager for WooCommerce, the issue is amplified because:- Premmerce Permalink Manager hooks into rewrite_rules_array filter- Each flush triggers the Premmerce filter, causing additional processing- The combination creates a cascade effect of rewrite rule regeneration## Contact InformationIf you need additional debugging information or access to a test site, please let me know.---**Priority**: High (Performance Impact)**Severity**: Critical (Affects site performance) ``` Viewing 4 replies - 1 through 4 (of 4 total) * Plugin Support [akshayathangaraj](https://wordpress.org/support/users/akshayathangaraj/) * (@akshayathangaraj) * [8 months ago](https://wordpress.org/support/topic/continuous-flush_rewrite_rules-causing-performance-issues/#post-18678325) * Hi, * Thanks for reaching out. This is Akshaya from WPLoyalty Support Team. * I’ve received your message and will get back to you shortly after reviewing the details. * Regards, * WPLoyalty support team. * Plugin Support [akshayathangaraj](https://wordpress.org/support/users/akshayathangaraj/) * (@akshayathangaraj) * [8 months ago](https://wordpress.org/support/topic/continuous-flush_rewrite_rules-causing-performance-issues/#post-18678621) * Hi, * Thanks again for your detailed report and the analysis — we really appreciate the time you took to outline the issue so clearly. * As a follow-up: We’ve enabled the rewrite rule flush by default to ensure endpoints are registered correctly out of the box. However, if you’d prefer to disable the automatic `flush_rewrite_rules()` behavior, you can use the following snippet as a workaround: * 🔗 **[Disable flush_rewrite_rules Gist](https://gist.github.com/alagesanbe08/f1f05ba2484c0e0b094c6aebff7c67b1)** * This will allow you to control when rewrite rules are flushed and help avoid unnecessary operations on every request. * Let us know if this resolves the issue on your end! * Regards, * WPLoyalty support team * [mikiwal1](https://wordpress.org/support/users/mikiwal1/) * (@mikiwal1) * [6 months, 1 week ago](https://wordpress.org/support/topic/continuous-flush_rewrite_rules-causing-performance-issues/#post-18736373) * [@akshayathangaraj](https://wordpress.org/support/users/akshayathangaraj/) is it ok to use the plugin with flush disabled? * it cannot be enabled caused very long loading Times. * Will it work with the snippet? * Plugin Support [haripradeepa](https://wordpress.org/support/users/haripradeepa/) * (@haripradeepa) * [6 months, 1 week ago](https://wordpress.org/support/topic/continuous-flush_rewrite_rules-causing-performance-issues/#post-18738861) * Hi, Thank you for reaching out! * To investigate this further and explore possible solutions, could you please submit a support ticket on our website at [WPLoyalty Support](https://wployalty.net/support/)? * This will help us analyze the situation more effectively and provide you with the best possible solution. Looking forward to your response! * Regards, WPLoyalty support team. Viewing 4 replies - 1 through 4 (of 4 total) The topic ‘Continuous flush_rewrite_rules() causing performance issues’ is closed to new replies. * ![](https://ps.w.org/wployalty/assets/icon-128x128.gif?rev=2971238) * [Loyalty Points Rewards and Referral for WooCommerce - WPLoyalty](https://wordpress.org/plugins/wployalty/) * [Frequently Asked Questions](https://wordpress.org/plugins/wployalty/#faq) * [Support Threads](https://wordpress.org/support/plugin/wployalty/) * [Active Topics](https://wordpress.org/support/plugin/wployalty/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/wployalty/unresolved/) * [Reviews](https://wordpress.org/support/plugin/wployalty/reviews/) * 4 replies * 4 participants * Last reply from: [haripradeepa](https://wordpress.org/support/users/haripradeepa/) * Last activity: [6 months, 1 week ago](https://wordpress.org/support/topic/continuous-flush_rewrite_rules-causing-performance-issues/#post-18738861) * Status: resolved