Q: MacBook Pro 2015 eating RAM

If you only have 8GB of ram installed the observed behavior is probably normal. For reference my iMac is currently using ~9.5GB of ram with mail, pages, a virtual box, and a half-dozen Safari tabs open. Top ram users are 'file caching' at 2.7GB and the OS (kernel_task+wired) at 974MB+1.9GB, 

Don't worry about using most of your memory, that is just El Capitian trying to streamline things in the background.. Maintaining low memory pressure is generally only a concern for those of us running off of HDDs where swap usage has to be avoided to maintain performance.

If you are still concerned I'd suggest running EtreCheck and posting the results.

Uninstall Clean My Mac. It is not needed and it may contribute to issues.

Are you experiencing a problem?

Yes uninstall CleanMyMac, using the uninstaller if provided and  test.

OS X does a very good job managing memory—it will utilize most all it has available, this is the new way since Mavericks.

You can read more on compressed memory:http://arstechnica.com/apple/2013/10/os-x-10-9/17/

I would not try to micro-manage your RAM.

As others noted it's normal for a Mac to use all available memory, but slow performance is not normal. Using ill-conceived "cleaning" apps will cause that to occur, eventually, if not immediately.

Josefa[ily] wrote:

 

With no apps running outside of finder and clean my mac, ...

Excerpted from Effective defenses against malware and other threats:

• Never install any product that claims to "clean up", "speed up", "optimize", "boost" or "accelerate" your Mac; to "wash" it, "tune" it, or to make it "shiny". Those claims are absurd.
  • Such products are very aggressively marketed. They are all scams.
  • They generally operate on the flawed premise that a Mac accumulates "junk" that needs to be routinely "cleaned out" for optimum performance.
  • Trial versions of those programs are successful because they provide the instant gratification of greater free disk space.
  • That increased space is the result of irreversible destruction of files, programs, or operating system components normally protected from inadvertent alteration or deletion. The eventual result will be unreliable operation, poor performance and random crashes that may not become evident for months or even years after their use, when updates to programs or OS X are eventually released.
  • Memory "cleaners" that circumvent OS X's memory management algorithms work by purging inactive memory contents to mass storage, which can only result in degraded performance and accelerated hardware failure.

Uninstalling "CleanMyMac" is not trivial and requires specific instructions.

Josefa[ily] wrote:

 

Yes, I am having a problem. My computer slows to the point it is unusable when my RAM is almost completely used.

 

I installed clean my mac

Uninstall CleanMyMac using the uninstaller, if provided and test.