How to fix A scheduled event is late : litespeed_task_imgoptm_pull, is late to run
To fix this issue, Login to The control panel of the client and then Open Filemanager and go to the concerned domain where the client is facing the issue.
In my case the domain was shinchaninhindi.com. So I went inside
domains>shinchaninhindi.com>public_html and then
1) Open the wp-config.php file and look for the line as under :
define('DISABLEWPCRON', true);
Make sure that this is set to true, if it is false, then set it to true as shown in the screenshot

2) Now go back to the control panel and add search for cron jobs as shown.
After searching, click on the cronjob box :

Now, click on create a new job

Now, add the values as under :

Add this command in the command section :
wget https://www.shinchaninhindi.com/wp-cron.php -O /dev/null

Here replace https://www.shinchaninhindi.com/ witht the URL of the website of client where you are fixing the issue.
Copy the URL From the URL bar

Now, Click on the Save button.
Now Login to the client's wordpress admin using Softaculous.
Then go to Tools > SiteHealth

Now see, that you should not see the error like :
A scheduled event is late
Under the Performance Tab.
If you do not see any error, then the issue has been resolved.
Thanks