El Capitan acting up...slowness, overheating


hello,
updated mid-2010 macbook snow leopard el capitan (at least thought). in addition inserted new 850 evo samsung (500gb) + 8 gb ram.
@ first, computer fast..applications loaded fast etc.
after 2 weeks, having issues it....one of noticable drop in speed...to point whole system (cursor) seems stalling..also see lot of spining wheels. can still work on it's weird...loading of stupid built-in dictionary can take 2-3 seconds, before instant. on boot-up too,before fast, not takes much longer. feels if still running old 5400rpm hdd. in fact, can point...just now, when letters typing need split second longer appear...again, stalling best description...or feeling if rewinding movie in slow motion.
in activity monitor, cpu usage jumps 10% 350%..with kernel_task. see printscreen below.
it's unpleasant work with.
on top of everything, uppper left-hand corner exteremely hot...and when place fingers next microphne, whole aluminium on "fire"..really hot touch. same true on of computer - same area. though fan not spinning. , battery says, when click on it: service battery (see prinscreent).

ps. seem computer gets hotter usage..i.e. if use word, stays cool. trouble starts browsing web....certain websites seem overheat whole thing..and cannot much.

cause this?
happening macbook?

have not experienced previous snow leopard. computer ssd , 8gb ram works worse 5400hdd , 4gb rmb (and didn't when freshly installed it). screen shot 2016-02-03 @ 4.21.50 pm.png screen shot 2016-02-03 @ 4.27.44 pm.png screen shot 2016-02-03 @ 4.29.16 pm.png screen shot 2016-02-03 @ 4.29.16 pm.png
please help, freaking me out!
 



Forums Macs macOS OS X El Capitan (10.11)


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