Try ShortPoint nowIf you are experiencing a slow performance on your SharePoint portal, below are a few standard checks that we recommended you perform:
Split Heavier ShortPoint Web Parts to Greatly Improve Editing Performance
If you're facing performance issues while editing a heavy ShortPoint web part which contains a lot of design elements and you're finding that the editing experience is slow then you can split it into multiple sections by cutting a ShortPoint section, adding a new ShortPoint web part below, then pasting the section there. You split a page into 2 or 3 ShortPoint web parts and this will greatly improve the editing speed.
Identify if it's browser which is causing the slowness
We all add extensions in our regular browser, and some of these extensions can slow down page performance. You can try accessing your pages using another browser that doesn't have extensions installed (Chromium based browsers are recommended: Chrome, Edge, Brave, Opera, Arc, etc.)
Check whether it is an issue with all sites or a particular site
To make sure whether it's a site-related or tenancy / farm-related problem, best would be to create a new site collection (if it's a farm - a new web application) to check whether it's an issue with a specific site only. This will narrow the scope of investigation.
Database connectivity
If it is a farm, you should check whether the connection to database is taking a long time.
Third party web parts
In many cases, we add third party web parts / add-ins or solutions to a page, which itself is connecting to other services, This can be the reason of the slow performance of pages. Try to remove each web part one by one and see if it is making difference in page speed.
Navigation
If your site is inheriting navigation from parent site and if the parent site is using structural navigation, this could be the reason for slowness. We recommend to break inheritance or using managed metadata navigation for better performance.
Search
If you are using SharePoint Roll-up which brings content from different sites, in the back-end, it is using search queries, and this can result in poor page performance.
Web parts
Avoid using too many web parts on the page as it would result in too many back-end requests and can make page slow.
ShortPoint
If you are using ShortPoint for SharePoint Online and you are accessing it behind firewall, please ensure that there are no extra filters on Java scripts loading from d2zzvnmppezkx.cloudfront.net domain that are causing delays in loading ShortPoint related elements.
Network Proxy and Firewall
If you have network proxy, it would be worth to check with the IT team whether it is blocking something, or the authentication in proxy is delaying your requests. Also, ensure that there is no IPS feature in your Firewall.
Publishing Feature
Please use SharePoint Publishing feature only if its required. Publishing sites are slower than Team sites.
Content Delivery Networks (CDN)
In case you or any of the third party tool (web part, app, solution or theme) are using the assets such as CSS, images, JavaScript or any other document, make sure they are hosted on CDN.
Other performance improvements:
