Report - MC4WP: Mailchimp for WordPress 4.9.8

Does MC4WP: Mailchimp for WordPress work with WordPress 6.3.1 and PHP 8.1.12? A smoke test was performed on 2023-10-03 12:36:08 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: 135.98 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	6.3.1
PHP version	8.1.12
MySQL version	10.6.10
PHP memory limit	512M

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=cc0a4cf656
Aspect	after-activation
HTTP status	200
Load time	0.312 s
Memory usage	3.07 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	0.229 s
Memory usage	2.93 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	0.210 s
Memory usage	2.95 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	0.182 s
Memory usage	2.94 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	0.213 s
Memory usage	2.94 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	0.181 s
Memory usage	2.91 MiB
JS errors	None
Resource errors	None

Test site – Just another WordPress site

URL	/
Aspect	front-page
HTTP status	200
Load time	0.196 s
Memory usage	3.21 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	2.252 s
Memory usage	5.25 MiB
JS errors	None
Resource errors	None

Benchmark

URL	Load time			Memory usage
URL	Inactive	Active	Change	Inactive	Active	Change
/wp-admin/index.php	0.361 s	0.335 s	-0.026 s	2.82 MiB	2.99 MiB	+ 173.47 KiB
/wp-admin/edit.php	0.213 s	0.216 s	+0.003 s	2.85 MiB	3.02 MiB	+ 171.63 KiB
/wp-admin/post-new.php	0.750 s	0.615 s	-0.135 s	5.21 MiB	5.29 MiB	+ 81.35 KiB
/wp-admin/upload.php	0.618 s	0.501 s	-0.117 s	2.77 MiB	2.92 MiB	+ 156.06 KiB
/wp-admin/options-writing.php	0.246 s	0.219 s	-0.027 s	2.76 MiB	2.89 MiB	+ 127.29 KiB
/wp-admin/media-new.php	0.494 s	0.205 s	-0.289 s	2.74 MiB	2.88 MiB	+ 147.52 KiB
/wp-admin/edit-tags.php?taxonomy=category	0.200 s	0.203 s	+0.003 s	2.76 MiB	2.93 MiB	+ 172.69 KiB
/wp-admin/post-new.php?post_type=page	0.612 s	0.587 s	-0.025 s	5.21 MiB	5.27 MiB	+ 65.52 KiB
/wp-admin/options-discussion.php	0.481 s	0.247 s	-0.234 s	2.75 MiB	2.9 MiB	+ 155.82 KiB
/wp-admin/edit-comments.php	0.261 s	0.222 s	-0.039 s	2.78 MiB	2.93 MiB	+ 155.36 KiB
/	0.309 s	0.345 s	+0.036 s	3.13 MiB	3.21 MiB	+ 89.03 KiB
Average	0.413 s	0.336 s	-0.077 s	3.25 MiB	3.38 MiB	+ 135.98 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

Markdown

Language		%	Lines of code	Comment lines	Files
	PHP	87.7%	7,878	5,046	120
	Markdown	10.4%	933	0	1
	SVG	1.1%	95	1	3
	XML	0.5%	44	0	1
	JavaScript	0.4%	32	1	9
	CSS	0.0%	4	0	4
Total			8,986	5,048	138

PHP Code Analysis | More results »

Lines of code	6,212
Total complexity	1,284
Median class complexity	13.0
Median method complexity	1.0
Most complex class	MC4WP_API_V3
Most complex function	MC4WP_List_Data_Mapper::map_list()

Classes	63
Methods	509
Functions	48

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 4.9.8