Report - MC4WP: Mailchimp for WordPress 4.8.6

Does MC4WP: Mailchimp for WordPress work with WordPress 5.9.1 and PHP 7.4.8? A smoke test was performed on 2022-02-22 16:21:30 UTC.

Summary

Errors

	No PHP errors, warnings or notices
	No JavaScript exceptions
	All test pages loaded successfully
	No resource errors
	Looks good! No problems were detected.

Performance

Memory usage: 194.89 KiB
The average PHP memory usage increased by this amount after activating by the plugin.

Page speed impact: insignificant.
The plugin didn't make the site noticeably slower.

Environment

WordPress version	5.9.1
PHP version	7.4.8
MySQL version	8.0.21
PHP memory limit	256M

Plugin Info

Last updated	2026-03-09T08:01:00+00:00
Active installs	1,000,000+
WordPress.org page	https://wordpress.org/plugins/mailchimp-for-wp/
Badges	Get badge code

Pages 8

Plugins ‹ Test site — WordPress

URL	/wp-admin/plugins.php?plugin_status=all&paged=1&s
Requested URL	/wp-admin/plugins.php?action=activate&plugin=mailchimp-for-wp%2Fmailchimp-for-wp.php&plugin_status=all&paged=1&s&_wpnonce=79d685b018
Aspect	after-activation
HTTP status	200
Load time	0.293 s
Memory usage	3.57 MiB
JS errors	None
Resource errors	None

MC4WP

URL	/wp-admin/admin.php?page=mailchimp-for-wp
Aspect	menu-item
HTTP status	200
Load time	0.221 s
Memory usage	3.51 MiB
JS errors	None
Resource errors	None

MC4WP → Form

URL	/wp-admin/admin.php?page=mailchimp-for-wp-forms&view=add-form
Requested URL	/wp-admin/admin.php?page=mailchimp-for-wp-forms
Aspect	menu-item
HTTP status	200
Load time	0.364 s
Memory usage	3.52 MiB
JS errors	None
Resource errors	None

MC4WP → Integrations

URL	/wp-admin/admin.php?page=mailchimp-for-wp-integrations
Aspect	menu-item
HTTP status	200
Load time	0.166 s
Memory usage	3.53 MiB
JS errors	None
Resource errors	None

MC4WP → Other

URL	/wp-admin/admin.php?page=mailchimp-for-wp-other
Aspect	menu-item
HTTP status	200
Load time	0.194 s
Memory usage	3.53 MiB
JS errors	None
Resource errors	None

MC4WP → Add-ons

URL	/wp-admin/admin.php?page=mailchimp-for-wp-extensions
Aspect	menu-item
HTTP status	200
Load time	0.175 s
Memory usage	3.49 MiB
JS errors	None
Resource errors	None

Test site – Just another WordPress site

URL	/
Aspect	front-page
HTTP status	200
Load time	0.308 s
Memory usage	3.46 MiB
JS errors	None
Resource errors	None

Widgets ‹ Test site — WordPress

URL	/wp-admin/widgets.php
Aspect	new-sidebar-widgets
HTTP status	200
Load time	1.284 s
Memory usage	5.35 MiB
JS errors	None
Resource errors	None

Benchmark

URL	Load time			Memory usage
URL	Inactive	Active	Change	Inactive	Active	Change
/wp-admin/index.php	0.302 s	0.383 s	+0.081 s	3.37 MiB	3.54 MiB	+ 171.52 KiB
/wp-admin/edit.php	0.174 s	0.197 s	+0.023 s	3.4 MiB	3.57 MiB	+ 170.41 KiB
/wp-admin/post-new.php	0.815 s	1.015 s	+0.200 s	6.14 MiB	6.32 MiB	+ 179.46 KiB
/wp-admin/upload.php	0.347 s	0.356 s	+0.009 s	3.25 MiB	3.48 MiB	+ 242.38 KiB
/wp-admin/options-writing.php	0.288 s	0.147 s	-0.141 s	3.24 MiB	3.46 MiB	+ 225.5 KiB
/wp-admin/media-new.php	0.274 s	0.148 s	-0.126 s	3.23 MiB	3.46 MiB	+ 242.55 KiB
/wp-admin/edit-tags.php?taxonomy=category	0.193 s	0.174 s	-0.019 s	3.27 MiB	3.49 MiB	+ 234.73 KiB
/wp-admin/post-new.php?post_type=page	0.664 s	0.826 s	+0.162 s	6.14 MiB	6.31 MiB	+ 175.05 KiB
/wp-admin/options-discussion.php	0.245 s	0.269 s	+0.024 s	3.22 MiB	3.42 MiB	+ 206.85 KiB
/wp-admin/edit-comments.php	0.294 s	0.199 s	-0.095 s	3.27 MiB	3.5 MiB	+ 233.67 KiB
/	0.321 s	0.209 s	-0.112 s	3.4 MiB	3.46 MiB	+ 61.62 KiB
Average	0.356 s	0.357 s	+0.001 s	3.81 MiB	4 MiB	+ 194.89 KiB

Code Statistics

Note: Third-party libraries and minified JS/CSS files are excluded from these statistics where possible, so the numbers you see here may be lower than those reported by other tools.

PHP

JavaScript

CSS

Language		%	Lines of code	Comment lines	Files
	PHP	68.3%	8,257	5,368	123
	JavaScript	14.8%	1,796	191	37
	CSS	8.2%	988	40	8
	Markdown	7.2%	869	0	1
	SVG	0.8%	95	1	3
	XML	0.8%	91	0	2
Total			12,096	5,600	174

PHP Code Analysis | More results »

Lines of code	6,855
Total complexity	1,402
Median class complexity	13.5
Median method complexity	1.0
Most complex class	MC4WP_API_V3
Most complex function	_mc4wp_update_groupings_data()

Classes	66
Methods	555
Functions	55

Additions

Things that the plugin adds to the site. This section is not intended to be comprehensive. The test tool only looks for a few specific types of added content.

Options `wp_options` 4

mc4wp
mc4wp_flash_messages
mc4wp_version
widget_mc4wp_form_widget

Custom Post Types 1

ID	Name
mc4wp-form	Mailchimp Sign-up Forms

Sidebar Widgets 1

ID	Name
mc4wp_form_widget	Mailchimp Sign-Up Form

PHP Error Log

The log file is empty.

MC4WP: Mailchimp for WordPress 4.8.6