Yes, adding a memory stick could definitely help improve your laptop's performance, especially if it's getting laggy with regular use. Before you upgrade, check the maximum RAM capacity your Dell model can handle and make sure the memory stick is compatible. Increasing the RAM should allow your laptop to run more smoothly, especially with multitasking or using memory-heavy applications.
I have used a Dell laptop, and I feel that the memory is very low, and the computer becomes more and more laggy the more I use it. Is it appropriate to add a memory stick in this case?