adminlitespeedmagento2.3pagespeed
As we have follow all steps to increase magento 2 speed like Advanced bundling, minify js and css but still we face speed issue in the admin.
Our admin take too much time to load grid as well as if redirect from one page to another page its simply loading and loading.
What is the issue here? We have installed Light mage cache in our server as we uses Light speed server.
Please give some suggestion.
First determine if it's front end rendering or the actual script execution that is slow. Check with the developer console in your browser for the Time To First Byte. This is how long the script take to process on the server
In the screenshot you can see it's quite low (200ms) so in this case the problem wouldn't be on the server but on front end. Now if it's over, let's say, a second you might want to optimize.
Before you slap on some boosters and extra caching which isn't a fix just a patch or band aid to hide the real issue try to figure out what exactly is slow. You can use several tools also for that.
Slow queries
Magento can be quite heavy on the database so turning on the Slow Query Log might be a good place to start. Check out this post on how to turn it on. The log will show you any query that takes longer than X seconds.
Profilers
Profilers help you gain insight into whats going on in your code. For Magento I would recommend starting with Aoe_Profiler. Just install it and turn it on. On the front end it'll give you an output like this:
Expand the results and check for large red blocks. Those are the actual times it took a certain part of the code to process. Look out for any 3rd party modules that are taking up a lot of time or memory.
Another great tool is Black fire. Since Aoe_Profiler is a module in Magento it doesn't show the underlying php processes and can crash on large installations with a lot of modules. Black fire runs on the server. With a hackathon we set up a Vagrant box with black fire you can use. Just put your project on there and fire it up. Check the Black fire site for more info how to use it.
Last one is probably my favorite: New Relic.
Unfortunately it's a paid service although they provide a free trial for pro accounts. After installing it on your server and connecting the profile wait a couple of hours for data to come in. Make sure there is some traffic on the shop tho.
New Relic also has a blog post on how to debug Magento which I can recommend. Also check out the ProxiBlue New Relic module for extra Magento data in New Relic.
Basically this will show you all of the above described features like slow queries, the processes in PHP etc and display it in easy graphs and tables. This should give you great insight in what is the issue in your installation.
And from here Now that you know what is causing the low performance you can move on to solving it. Check forums like this one or Google for the part or module of Magento that is slow. A lot of issues are well known and others have solved it before. Or, if you can't find a solution post your question here and include your findings in the question
Best Answer
The page loading speed depends on various other factors which you have mentioned: