High CPU after send newsletter

  • gemedj89

    (@gemedj89)


    2 weeks, 6 days ago

    Hello,

    we are experiencing a problem caused by a very high number of concurrent requests generated by MailPoet’s tracking system on our WordPress website when send newsletter.

    Specifically, we are seeing a huge amount of requests to endpoints like:

    /index.php?mailpoet_router&endpoint=track&action=open&data=...

    These requests are executed simultaneously from many different IP addresses and are causing significant server load, resulting in slowdowns and resource usage spikes.

    From the logs, we can see hundreds/thousands of very close requests related to email open tracking.

    We would like to understand whether there are any solutions or alternative configurations that would allow us to:

    • keep open/click tracking enabled;
    • reduce the number of concurrent requests;
    • reduce server impact;
    • avoid full PHP execution through index.php for every tracking request.

    We would also like to know:

    1. whether there are MailPoet-side optimizations available;
    2. whether tracking can be delegated to external services or a CDN;
    3. whether there are recommended hooks, filters, or server-side configurations;
    4. whether the tracking system can be made less CPU/PHP intensive.

    Thank you.

    • This topic was modified 2 weeks, 6 days ago by gemedj89.
Viewing 2 replies - 1 through 2 (of 2 total)
  • Plugin Support nathvi V. a11n

    (@nathvi)

    2 weeks, 5 days ago

    Hi @gemedj89

    We’ve seen similar reports from other users where CPU spikes happen shortly after sending a newsletter, and the causes have varied depending on the hosting environment, task scheduler configuration, and tracking settings. To help us understand what’s happening in your specific case and point you in the right direction, could you share the following?

    1. Your MailPoet System Info Go to MailPoet → Help → System Info tab and copy/paste the text here. This tells us your plugin version, sending method, task scheduler setting, and server environment.

    2. Your System Status page Go to MailPoet → Help → System Status and share a screenshot. We want to check whether the Task Scheduler connection is successful and whether there are any cron or sending queue errors.

    3. Your hosting provider and plan Some hosts are more sensitive to MailPoet’s background processes than others. Knowing your host will help us recommend the right task scheduler configuration.

    4. How many subscribers you’re sending to when this happens?

    In the meantime, here are a few things that have helped other users in similar situations:

    • Use a page caching plugin or CDN (e.g. Cloudflare): This can help absorb the burst of tracking requests so they don’t all hit your PHP/database layer.
    • Switch the task scheduler to Server Side Cron (Linux Cron): This is often the most effective fix for CPU spikes related to MailPoet. More info: Newsletter Task Scheduler — Server side cron
    • Review your tracking level: Under MailPoet → Settings → Advanced → Engagement analytics tracking, if you have it set to “Full”, consider switching to “Partial” to reduce the number of tracking callbacks per email.

    Looking forward to your details so we can narrow this down!

    Thread Starter gemedj89

    (@gemedj89)

    2 weeks, 5 days ago

    System status :

    MailPoet System Status Report

    Generated: 2026-05-20T07:25:12.888Z Site & Account

    • Site name: ****
    • Email: news@*
    • MailPoet Premium/MSS key: ****** (valid; premium: valid)
    • Plugin installed at: 2023-05-11 11:31:27
    • Installed via WooCommerce onboarding wizard: no
    • Total subscribers: 6000

    Versions

    • MailPoet Free: 5.26.1
    • MailPoet Premium: 5.22.0
    • WordPress: 6.9.4
    • PHP: 8.2.30
    • Database: 10.5.29-MariaDB-deb11-log
    • Action Scheduler: 3.9.2

    Environment

    • Web server: Apache/2.4.67 (Debian)
    • Server OS: Linux 724**.cloudwaysapps.com ***.21-cloud-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.90-1~bpo11+1 (2024-05-06) x86_64
    • Multisite: No
    • Current theme: Salient Child Theme (version 1.0)
    • WordPress language: it_IT
    • WordPress timezone: Europe/Rome

    WordPress & PHP Config

    • WP_MEMORY_LIMIT: 40M
    • WP_MAX_MEMORY_LIMIT: 1600M
    • WP_DEBUG: nessuno
    • PHP max_execution_time: 600
    • PHP memory_limit: 1600M
    • PHP upload_max_filesize: 64M
    • PHP post_max_size: 64M

    Active Plugins (57)

    • Smart Custom 404 Error Page: by NerdPress – 11.4.8
    • AddToAny Share Buttons: by AddToAny – 1.8.17
    • AMP: by AMP Project Contributors – 2.5.5
    • Analytify Dashboard Widget: by Analytify – 7.1.2
    • PublishPress Capabilities Pro: by PublishPress – 2.32.0 (update to version 2.43.0 is available)
    • Anti-Spam by CleanTalk: by CleanTalk – Anti-Spam Protection welcome@cleantalk.org – 6.79
    • Contact Form 7: by Rock Lobster Inc. – 6.1.6
    • Copyscape Premium: by Copyscape / Indigo Stream Technologies – 1.4.2
    • Datawrapper oEmbed: by Datawrapper GmbH – 1.0
    • Elastic Email Sender: by Elastic Email Inc. – 1.2.22
    • Elementor Pro: by Elementor.com – 3.35.1 (update to version 4.0.4 is available)
    • Elementor: by Elementor.com – 3.35.6 (update to version 4.0.9 is available)
    • EWWW Image Optimizer: by Exactly WWW – 8.6.0
    • Fatal Error Notify Pro: by Very Good Plugins – 1.14.2
    • Loco Translate: by Tim Whitlock – 2.8.4
    • MailOptin – Standard: by MailOptin Team – 2.2.76.0
    • MailPoet Premium: by MailPoet – 5.22.0 (update to version 5.27.0 is available)
    • MailPoet: by MailPoet – 5.26.1 (update to version 5.27.0 is available)
    • Notification : Conditionals: by BracketSpace – 3.0.2
    • Notification : Prevent Duplicated: by BracketSpace – 1.0.0
    • Notification: by BracketSpace – 9.0.10
    • OneSignal Push Notifications: by OneSignal – 3.8.1
    • Open External Links in a New Window: by WebFactory Ltd – 1.45
    • Print My Blog Pro: by Michael Nelson – 3.27.16
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    • PublishPress Statuses Free: by PublishPress – 1.3.2
    • Really Simple CAPTCHA: by Takayuki Miyoshi – 2.4
    • PublishPress Revisions Pro: by PublishPress – 3.7.24 (update to version 3.8.1 is available)
    • User Registration & Membership: by WPEverest – 5.1.6
    • W4 Post List: by Shazzad Hossain Khan – 2.5.5
    • Wordfence Security: by Wordfence – 8.2.2
    • Yoast SEO Premium: by Team Yoast – 27.6
    • Yoast SEO: by Team Yoast – 27.6
    • WP Rocket: by WP Media – 3.21.3
    • Yoast SEO: News: by Team Yoast – 13.3
    • Yet Another Related Posts Plugin (YARPP): by YARPP – 5.30.11

    Sending Configuration

    • Sending method: MailPoet
    • Send all site’s emails with: current sending method
    • Sending frequency: Gestito da MailPoet Sending Service
    • Default FROM address: news@*
    • Default Reply-To address: news@*
    • Bounce email address: news@*

    Connection to MailPoet Sending Service

    • Enabled: si
    • Reachable: si
    • Ping response: 200 HTTP status code
    • API key state: valid
    • Premium key state: valid

    Task Scheduler / Cron

    • Status: active
    • Task Scheduler method: Action Scheduler
    • Ping URL: https://www.*?mailpoet_router&endpoint=cron_daemon&action=ping
    • Accessible: nessuno
    • Ping response: pong
    • Last updated: 19 Maggio 2026 10:12
    • Last run started: 19 Maggio 2026 10:12
    • Last run completed: 19 Maggio 2026 10:12
    • Last seen error: nessuno

    Action Scheduler Status

    • Storage type: DBStore
    • Next trigger run: 19 Maggio 2026 11:44
    • Last trigger run: 19 Maggio 2026 11:44
    • Last worker run: 19 Maggio 2026 10:12

    Sending Queue

    • Status: in esecuzione
    • Started at: 15 Maggio 2026 12:28
    • Sent emails: 0
    • Retry attempt: nessuno
    • Retry at: sconosciuto
    • Error: nessuno
    • Total completed tasks: 6447
    • Total running tasks: 0
    • Total paused tasks: 1
    • Total cancelled tasks: 0
    • Total scheduled tasks: 1

    Data Inconsistency

    • Orphaned sending tasks: 0
    • Orphaned sending task subscribers: 0
    • Sending queue without newsletter: 0
    • Orphaned subscriptions: 0
    • Orphaned links: 0
    • Orphaned newsletter posts: 0

    HOSTING : CLOUDWAYS 4 GB premium

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