Laptop Memory Upgradation

[Ahsan2015]

Hello everyone,

i bought my laptop in 2015. Recently i changed operating system from win 7 to win 10. After that i am feeling that my laptop memory need to upgrade it is now consist of a 4gb memory. And i am facing some slowness for various software to use and even when my laptop is opening it took longer time than before and even when i click on start button it took sometimes more than 7 seconds to open even longer sometimes and it applies to windows explorer and even for a file opening. I don't know what to do?

I am thinking of upgrading ram with an another 4gb memory. Because i read when i tried to find about upgrading ram of laptop that in both slot laptop ram should be same size according to the capability the laptop can utilize.

So i am seeking for a suggestion for what to do?

[WAWood]

@Ahsan2015 

Windows 10 works just fine with 4GB of memory, and although adding 4GB more will likely produce some improvement, if your PC is running slowly, that is not due to lack of memory.

[Ahsan2015]

Then how can i understand what's the cause of this slowness. And for up-gradation if i add 4gb ram of the same specification it has now but from other brand will it cause any problem for being different brand in 2 slots.