Not Prepar3d but if you're interested in just flying, your current laptop (mine has lower specs) will run FSX Steam consistently at 30 fps using older add-ons such as Ground Environment, Ultimate Terrain, FreeMesh, Aime Leclercq's road textures (download from Avsim), HDE Sky textures (flyawaysimulation.com), etc. If you must have P3D, try disabling ORBX and see if it makes any difference.
I use it as my go-to entertainment when traveling and when I'm more interested in flying than enjoying VFR best-in-class scenery such as ORBX (I couldn't use this in my laptop... I removed it because I didn't feel like investigating why it adversely impacted frame rates... although I highly suspected it was due to my 5400 rpm boot drive).