Reply to MBP 2.7ghz I7 has trouble running traktor w/ all my gear.. will ssd hd upgrade fix it

so, i'm using a 2011 macbook pro 2.7 ghz I7 w/ 4gb of ram and a 500gb sata drive. my gear includes A6 with rane ttm56 and 1200's (i like to scratch a lot), S4 & maschine with a cool mapping i found on digitaldjtools.net which gives me full control of remix decks c & d. i use one turntable as deck c remix deck with maschine, and 1 turntable as deck b track deck... deck a I control with the S4, and deck d with just the maschine. i select the A6 as the audio device and use the S4 & maschine as midi controllers

When i run just two decks with the A6, the computer is ok, no issues. but once i start using decks c & d, especially if I have them loaded as remix decks, the computer starts to have a hard time.

1 - if ive been working in the remix decks for a while, sometimes the maschine stops responding (hit the button nothing happens) and I have to restart traktor, obviously super lame if im playing a show

2 - even though i adjust latency, with the maschine & remix decks sometimes when I trigger a sample cell in a slot that is not currently playing, there is a delay or slight lag.. clearly super lame as well because it sounds like poopoo

3 - again if I've been working in the remix decks for a while, and I close traktor while a remix deck is loaded, traktor freezes up at the 'storing collection' message and I have to force quit out losing whatever work ive done (sucks when building the remix sets) i have however found a work around for this by simply switching decks c & d to track decks in stead of remix decks before closing traktor, when i do this it doesnt crash

just in general seems like the computer struggles with the workload I'm putting on it

so my question is, will upgrading to 8gb of ram and a 256gb SSD drive fix this or should I go ahead and get a new computer that already has that with with an upgraded processor.

is the processor on the macbook I already have capable to run my setup without issues?

any input is appreciated thanks!!