We can certainly offer to help determine if what RAM you have now can work better for you.
If you are experiencing issues that suggest you need more RAM, please post them. Often, a symptom thought to be RAM starvation turns out to be something else. Anti-virus and so-called "cleaning" apps can drag down performance; some people find out that 8GB works for them once they rid their computer of useles. Adware can slow a computer too regardless of how much RAM is installed.
We can likely determine this in one step if you post a snapshot of your system configuration. Fortunately there is a safe, secure way to do that.
We can quickly and within the confines of these forums help you determine if software issues are the problem if you use EtreCheck, available free from the Mac App Store here:
https://itunes.apple.com/us/app/etrecheck/id1423715984?mt=12
We can also see hard data about drive performance and RAM usage. Etrecheck is the development of a long-serving and trusted contributor here expressly for displaying information in these forums to help us help you. It will not reveal any personal or secure information.
Run it, select “Report" from the left-hand pane (scroll down to the bottom of that pane to find)
When its report displays, click the "Share Report" icon from EtreCheck’s toolbar and then "Copy report” from the resulting dropdown.
⚠️ Please DO NOT highlight the text in the report before using Etrecheck’s “Copy report” command—that will garble the formatting and make the report slower and harder to evaluate.
Changes in late 2018 to the forum software require you use the “Additional Text" icon (see example below) to embed the report into a post:
Paste the report into the resulting “Additional Text” window.
