Horizontal lines appear in various programs on macbook pro that gets very hot.

Question

  Model Name:
MacBook Pro
  Model Identifier:
MacBookPro1,2
  Processor Name:
Intel Core Duo
  Processor Speed:
2.16 GHz
  Number Of Processors:
1
  Total Number Of Cores:
2
  L2 Cache:
2 MB
  Memory:
2 GB
  Bus Speed:
667 MHz
  Boot ROM Version:
MBP12.0061.B03
  SMC Version (system):
1.5f10
  Serial Number (system):
W86241X4TJ1
  Hardware UUID:
00000000-0000-1000-8000-0016CB902C12
  Sudden Motion Sensor:
  State:
Enabled
thin horizontal lines appear occasionally across window of firefox, if i switch to finder, not there. appears to stay with windows of different programs.
lately above the keyboard along back edge in the middle under monitor gets very hot almost to hot to touch, uncomfortable on lap.
i have no idea what the memory cards are. some have suggested i should replace memory cards?

Answer 1

I don't really know about the new models as far as typical operating temperatures. The ones you mention are not meaningfully high to me. My 2011 13" MBP with an i5 CPU typically idles near 50º C.
As for the speed issue that is hard to evaluate on the basis of personal opinion. You can download and run GeekBench benchmarks and compare the results to those reported for the same model configuration. You can use CineBench to benchmark video performance.