Just upgraded hard drive and memory, computer very slow

i have macbook pro (mid 2012). upgraded 500gb sata hard drive 1t sata hard drive, , 4 gb ram 8 gb ram. mac os 10.12.6
@ first seems run ok, not lot of improvement little better. after couple weeks (used maybe twice), running extremely slow.
have done:
smc/pram resets
full system check - no errors
malware scan - no threats
closed applications in activity monitor
unchecked start apps
checked system information , hard drive verified - both ram ok
i'm not sure else do, or problem is. appreciated, thanks.

--- post merged, nov 1, 2017 ---

hardware overview:

model name: macbook pro

model identifier: macbookpro9,2

processor name: intel core i5

processor speed: 2.5 ghz

number of processors: 1

total number of cores: 2

l2 cache (per core): 256 kb

l3 cache: 3 mb

memory: 8 gb

boot rom version: mbp91.00d3.b22

smc version (system): 2.2f44

serial number (system):

hardware uuid:

sudden motion sensor:

state: enabled

macintosh hd:

available: 718.02 gb (718,019,485,696 bytes)

capacity: 999.35 gb (999,345,127,424 bytes)

mount point: /

file system: journaled hfs+

writable: yes

ignore ownership: no

bsd name: disk0s2

volume uuid:

physical drive:

device name: st1000lm048-2e7172

media name: st1000lm048-2e7172 media

medium type: rotational

protocol: sata

internal: yes

partition map type: gpt (guid partition table)

s.m.a.r.t. status: verified

memory slots:


ecc: disabled

upgradeable memory: yes


bank 0/dimm0:


size: 4 gb

type: ddr3

speed: 1600 mhz

status: ok

manufacturer: 0x802c

part number: 0x384b54463531323634485a2d314736453120

serial number:


bank 1/dimm0:


size: 4 gb

type: ddr3

speed: 1600 mhz

status: ok

manufacturer: 0x802c

part number: 0x384b54463531323634485a2d314736453120

serial number:

 

could faulty hard drive cable not uncommon on mbps.

personally, recommend replacing 1 tb ssd. use dvd caddy connect 1 tb or 500 gb optical sata connection.

 

Forums Macs Notebooks MacBook Pro

• iPhone
• Mac OS & System Software
• iPad
• Apple Watch
• Notebooks
• iTunes
• Apple ID
• iCloud
• Desktop Computers
• Apple Music
• Professional Applications
• iPod
• iWork
• Apple TV
• iLife
• Wireless