Slow image upload for listing submission

Background
Whenever a user submits a listing on our site, it takes really long for the images to be uploaded. To illustrate, without images a listing submits in <2 seconds, but when images are added, for example with a total ~10MB, it takes 90 seconds (1.5 minutes). This is obviously way to long and users will leave the website before the upload finishes.

What we in contact with the theme (listify) developers and server maintainers have tried:

• add_filter( ‘big_image_size_threshold’, ‘__return_false’ );
• Listing submit with the Twenty Nineteen theme instead of listify – upload time is even higher according to listify developer
• Tried older version of WP job manager (1.32.3)
• Moved to a different webhost (the current one), that is specific for wordpress sites and focusses on speed (https://getflywheel.com/why-flywheel/site-speed/)
• Increasing the WP_MEMORY_LIMIT to 256M
• Increase resources for PHP processes (this went via the server so not entirely sure what the exact settings were)
• Tried different geographical locations

The webhost noticed PhP processes that took “long” (>5 seconds to log) when submitting a listing:

[0x00007fa84fa1f0f0] unsharpmaskimage() /wordpress/wp-includes/class-wp-image-editor-imagick.php:363
[0x00007fa84fa1efe0] thumbnail_image() /wordpress/wp-includes/class-wp-image-editor-imagick.php:535
[0x00007fa84fa1eee0] crop() /wordpress/wp-includes/class-wp-image-editor-imagick.php:263
[0x00007fa84fa1ed90] resize() /wordpress/wp-includes/class-wp-image-editor-imagick.php:479
[0x00007fa84fa1ecd0] make_subsize() /wordpress/wp-admin/includes/image.php:435
[0x00007fa84fa1eba0] _wp_make_subsizes() /wordpress/wp-admin/includes/image.php:362
[0x00007fa84fa1ea80] wp_create_image_subsizes() /wordpress/wp-admin/includes/image.php:476
[0x00007fa84fa1e8a0] wp_generate_attachment_metadata() /www/wp-content/plugins/wp-job-manager/includes/forms/class-wp-job-manager-form-submit-job.php:745
[0x00007fa84fa1e740] create_attachment() /www/wp-content/plugins/wp-job-manager/includes/forms/class-wp-job-manager-form-submit-job.php:818
[0x00007fa84fa1e5f0] update_job_data() /www/wp-content/plugins/wp-job-manager/includes/forms/class-wp-job-manager-form-submit-job.php:614
[0x00007fa84fa1e500] submit_handler() /www/wp-content/plugins/wp-job-manager/includes/abstracts/abstract-wp-job-manager-form.php:95
[0x00007fa84fa1e440] process() /wordpress/wp-includes/class-wp-hook.php:288
[0x00007fa84fa1e360] apply_filters() /wordpress/wp-includes/class-wp-hook.php:312
[0x00007fa84fa1e2f0] do_action() /wordpress/wp-includes/plugin.php:544
[0x00007fa84fa1e230] do_action_ref_array() /wordpress/wp-includes/class-wp.php:742
[0x00007fa84fa1e1b0] main() /wordpress/wp-includes/functions.php:1255
[0x00007fa84fa1e110] wp() /wordpress/wp-blog-header.php:16
[0x00007fa84fa1e080] INCLUDE_OR_EVAL /www/index.php:17

Help
We have been looking for the cause now for more than 2 weeks but can not seem to locate it. The Listify developer thought it was related to the server, and the latest comment of the server maintainers was that it may relate to the implementation of the image upload. Hence I came to this forum in the hope to finally find something that may cause this – if related to WP job manager or not since that also is valuable information.

Thankyou in advance!
Rick

• This topic was modified 4 years, 5 months ago by rickcode.
• This topic was modified 4 years, 5 months ago by rickcode.
• This topic was modified 4 years, 5 months ago by rickcode.
• This topic was modified 4 years, 5 months ago by Yui. Reason: extra link deleted

The page I need help with: [log in to see the link]