Website running slow

hs.khoo 2021-02-22 06:55:33 UTC #1

Keywords: WordPress - AWS - Technical issue - Other
bnsupport ID: 31c8b37f-5ff3-201a-4b51-2f08af286ca2
Description:
Hi,

My website started to run slow recently.
I've checked the memory and disk usage. It looks fine.
However, it is starting to run slow and will down sometimes.
How can I check what will the problem be? Or how can I check whether I should upgrade my instance?

My Lightsail instance currently running on 4 GB RAM, 2 vCPUs, 80 GB SSD

Average cpu utilization per 1 hour for 1 week.
https://imgur.com/UfXnfoT

Average cpu utilization per 1 hour for 1 day.
https://imgur.com/rNOO1uw

Average cpu utilization per 1 hour for 1 hour.
https://imgur.com/QNO8xyA

Support Bundle
31c8b37f-5ff3-201a-4b51-2f08af286ca2

jota 2021-02-22 10:10:56 UTC #2

Hi @hs.khoo,

I can see that the main problem of your website is the time to first byte.

https://www.webpagetest.org/result/210222_DiBS_35bd189189244fc836ef68e848ea42e4/

That's probably due to the theme you are using and the resources it needs to load. I can also see that the machine is running out of free RAM memory and that can be also the problem with the performance of your website. Please review the theme/plugins you are using to see if any of them is causing these performance problems.

-----------------------------------
Display amount of free and used memory in the system
-----------------------------------
Running: free -m
In: /opt/bitnami

Output:

              total        used        free      shared  buff/cache   available
Mem:           3950        2265         207         168        1477        1205
Swap:             0           0           0

Happy to help!

Was my answer helpful? Click on

hs.khoo 2021-03-01 07:38:23 UTC #3

Hi jota,

You mentioned about running out of free RAM memory.

The free RAM memory is read from the column "free" value 207?

Is there a way I can check which themes/plugins are using up the free memory? Or how can I clear up the RAM memory?

And I had just created new instance for my site. It kept loading slow and showing waring "Load canceled due to load timeout" and errors "net::ERR_HTTP2_PROTOCOL_ERROR 200" in the admin dashboard products / categories pages.

Thanks!

michiel 2021-03-01 13:04:49 UTC #4

Hi @hs.khoo,

Having too little RAM memory usually can cause other issues like the timeout error. I recommend disabling each plugin one by one and check if the performance improves:

wp plugin --deactivate PLUGINNAME

Regards,
Michiel

hs.khoo 2021-03-01 13:23:11 UTC #5

(post withdrawn by author, will be automatically deleted in 24 hours unless flagged)

hs.khoo 2021-03-01 13:51:02 UTC #6

Hi @michiel,

As my live site need to be running, so I cant deactivate and debug on the live site unless on the weekends.
If I were to duplicate the same instance and check for the plugin issues, will it be the same as for the live site?
However, I tried on the duplicated site, the site was working fine, but not the live site.

And based on the last few days status, the live site will run smoothly in day time but not at night time (Malaysia Time).
Could it be I need to upgrade my Lightsail instance?

Thanks.

jota 2021-03-02 07:38:44 UTC #7

Hi @hs.khoo,

You should be able to replicate the problem in the duplicated instance. If you can't do it, it's because there is more traffic in the live instance and that's probably the root cause of the problem.

Have you checked if a bot/attacker is accessing your site with malicious intentions?

https://docs.bitnami.com/aws/apps/wordpress/troubleshooting/deny-connections-bots-apache/

hs.khoo 2021-03-03 15:18:23 UTC #8

Hi @jota,

I think that will be it. As I've been fixing errors reported in error_logs for the past few days, but it did not load slowly as the live site that still loading slowly.

I am using Sucuri, eventually Sucuri had modified the connection and the source IP at the network level will be shown as the Website Firewall IP address and not the visitor’s.

Their support had shared me regarding on getting the real visitor's IP, I will look into that.
https://docs.sucuri.net/website-firewall/troubleshooting/same-ip-for-all-users/

While I check if there's bot/attacker accessing, there's still few query:

How do I know if my instance can support my live traffics?
I tried to put my site under maintenance to reboot my instance. The free memory value reported to be ~1.3GB. But it still load slow that I cant access to wordpress dashboard.

Just in case, this is the new support bundle code after reboot.
ed0802d1-aad3-f974-994f-bee02fe0d472

"The files listed below are bigger than 10MB and have not been included, please notify the support agent.
/opt/bitnami/apache2/logs/error_log"

Is the error_log one of the reason that consuming free_memory?

Sorry if I'm throwing too much questions at one time.
Thank you for your assistance!!

jota 2021-03-04 10:16:25 UTC #9

Hi @hs.khoo,

You can check the free RAM memory in the instance but there are other indicators like the max requests errors in the Apache's log or in the PHP-FPM's log. For example, I found these errors in the PHP-FPM's log

[02-Mar-2021 14:59:14] WARNING: [pool wordpress] server reached pm.max_children setting (25), consider raising it
[02-Mar-2021 16:43:13] WARNING: [pool wordpress] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 8 children, there are 3 idle, and 14 total children

You can try to increase those values in the php-fpm conf file (you can take a look at this other post to edit the file https://community.bitnami.com/t/site-is-down-because-of-too-many-dispatching-errors-ah01075-error-dispatching-request-to-polling/91559/3?u=jota)

I still see errors in the Apache's log too

[Wed Mar 03 23:08:47.619447 2021] [proxy_fcgi:error] [pid 2056:tid 139982186448640] [client 66.248.202.19:36440] AH01071: Got error 'PHP message: PHP Warning:  Unknown: Input variables exceeded 1000. To increase the limit change max_input_vars in php.ini. in Unknown on line 0', referer: https://hometaste.my/wp-admin/edit.php?s&post_status=all&post_type=shop_order&action=-1&_shop_order_order_month&_shop_order_delivery_month&_shop_order_complete_date&_shop_order_order_date&_shop_order_delivery_date&_shop_order_section=Lunch&_shop_order_delivery_time&_shop_order_zone&_shop_order_chef=Lau&_shop_order_payment_method&_coupons_used&_shop_order_billing_name&_shop_order_remaining_days&_customer_user&filter_action=Filter&paged=1&action2=-1

Please check the following guide to troubleshoot server issues:

https://docs.bitnami.com/general/apps/wordpress/troubleshooting/debug-errors-apache/

Some WordPress files don't have the expected permissions. Please check the following guide:

https://docs.bitnami.com/general/apps/wordpress/administration/understand-file-permissions/

and I also found WordPress plugin related error messages in the Apache error log.

[Wed Mar 03 23:09:17.914982 2021] [proxy_fcgi:error] [pid 2425:tid 139981926274816] [client 66.248.202.19:40018] AH01071: Got error 'PHP message: PHP Warning:  array_merge(): Expected parameter 2 to be an array, null given in /opt/bitnami/apps/wordpress/htdocs/wp-content/plugins/woocommerce-delivery-area-pro/woocommerce-delivery-area-pro.php on line 311PHP message: PHP Warning:  count(): Parameter must be an array or an object that implements Countable in /opt/bitnami/apps/wordpress/htdocs/wp-content/plugins/woocommerce-delivery-area-pro/woocommerce-delivery-area-pro.php on line 331PHP message: PHP Warning:  array_diff(): Expected parameter 2 to be an array, null given in /opt/bitnami/apps/wordpress/htdocs/wp-content/plugins/woocommerce-delivery-area-pro/woocommerce-delivery-area-pro.php on line 332PHP message: PHP Warning:  array_diff(): Expected parameter 1 to be an array, null given in /opt/bitnami/apps/wordpress/htdocs/wp-content/plugins/woocommerce-delivery-area-pro/woocommerce-delivery-area-pro.php on line 333PHP message: PHP Warning:  Invalid argument supplied for foreach() in /opt/bitnami/apps/wordpress/htdocs/wp-content/plugins/woocommerce-delivery-area-pro/woocommerce-delivery-area-pro.php on line 388PHP message: PHP Warning:  Invalid argument supplied for foreach() in /opt/bitnami/apps/wordpress/htdocs/wp-content/plugins/woocommerce-delivery-area-pro/woocommerce-delivery-area-pro.php on line 372', referer: https://hometaste.my/wp-admin/post.php?post=374095&action=edit

Please check the following guide to deactivate plugins:

https://developer.wordpress.org/cli/commands/plugin/deactivate/

or contact the plugin's developer to know more about that.

Bitnami provides free all-in-one installers, virtual machines and cloud images for popular open source applications. Get them now!