Should I increase RAM from 4GB to 8GB

Open Task Manager, click "More details" in the lower-left corner (if it already says "Less details", skip this), then go to the Performance tab and see how much memory your system is using during your normal workloads.  If it's using more than half, then adding more memory will likely improve performance.  Windows generally won't allow ALL of the system memory to be used because it will try to keep some available for new applications in use, etc, so you shouldn't wait to see extremely high utilization before deciding to add more memory.  And if more memory is available and nothing else needs it, Windows will start using other optimizations.  For example, if it notices that you tend to use a particular application frequently, it will preload that into memory even when you haven't launched it as long as nothing else is using that memory.  If something else needs it, then memory used for those types of optimizations will be returned, but if you end up launching that application, then obviously that will happen faster if it's been preloaded into memory.  On Windows 10, this is shown under Task Manager when you click the Memory tab as "Standby memory".  As an example, on my system I have 16GB of memory.  8.1GB of that shows as "In use", but an additional 7.6GB is being used for standby.  So even if you DON'T see a lot of memory being actively used, Windows can find ways to take advantage of additional memory if you provide it.

If you want to add memory, go to support.dell.com, search your laptop model name (or Service Tag), select the Manuals & Documents section, and download the Owner's Manual or Service Manual.  The "Desktop-L3E8E1" name you provided is just your Windows computer name, not your laptop model.  But once you find that, one of those documents will have step-by-step guides for how to remove and install each component of the system, complete with diagrams.  Memory is typically very easy to access.  However, you should check to see what you currently have in terms of available slots in your system.  If your system's 4GB of memory comes from a single 4GB module and you have another memory slot that's open, then you could just buy another 4GB module and add it.  If your system has 2x 2GB sticks and no open slots, then you would need to buy 2x 4GB sticks instead and remove the existing modules.  In terms of choosing the right memory, Crucial.com has a convenient tool for recommending memory that is compatible with your specific system.  Of course it only recommends Crucial brand memory, but they're a solid brand.

My brand new dell 3593 is running extremely slow. It even takes long to open a single browser. multitasking is out of question. Talked to chat support, but no solution. what should i do?

@anitapan 

Create your post. You are not even in the right forum. This is for Vostro laptops.

ok, thank you

This trick can boost your pc performance not ram. 

Open file explorer. RIGHT CLICK ON IT. CLICK ON PROPERTIES. 

ON SIDE CLICK ON advance system setting. Go to advance tab. In performance bar click on setting. 

On virtual memory (RAM) bar. Click on change. Uncheck the box in the top. 

Choose any drive and set to 4097 on first and 8192 on second and click on apply and restart your pc. Done. This will help to improve the performance of your pc. 

Welcome to the Dell Community @Ghggh 

You missed the most important one.

Look here.

https://www.dell.com/community/Inspiron/INSPIRON-15-3567-programs-take-ages-to-initiate/m-p/7440154#M70660

Best regards,

U2

same problem here