I have have a MacBook pro late 2010 (now 4 years old), I use it everyday and there's a graphical issue where letters in the browser become blurry and broken, some kind of weird glitch happens all the time.
Whenever I scroll on a page or write content in an input, using google chrome letters become like this (click on the picture so you understand what happens).
This is very disturbing when reading.
What I tried
They work a bit better
I have tried on Opera browser and on Safari and this doesn't happen (at least, did not happen as often as chrome). I used firefox for a while now, went better, but Playing videos on firefox does the glitch too. I switched to Firefox Developer Edition and can't tell when was the last time I experienced an issue (see end of question and answers, may help too).
Nope. I created a new chrome user (with no plugin installed), still does that flickering.
Nope. Tried this multiple times, still the same.
Trying other versions of Chrome
Nope. Thought it worked fine, used it for 30 minutes, does the same again.
I am currently running
Yosemite but it's been doing this for a long time.
Hardware Overview: Model Name: MacBook Pro Model Identifier: MacBookPro6,1 Processor Name: Intel Core i7 Processor Speed: 2.66 GHz Number of Processors: 1 Total Number of Cores: 2 L2 Cache (per Core): 256 KB L3 Cache: 4 MB Memory: 8 GB Processor Interconnect Speed: 4.8 GT/s Boot ROM Version: MBP61.0057.B0F SMC Version (system): 1.57f17 Serial Number (system): *** Hardware UUID: *** Sudden Motion Sensor: State: Enabled Intel HD Graphics: Chipset Model: Intel HD Graphics Type: GPU Bus: Built-In VRAM (Total): 288 MB VRAM (Dynamic, Max): 10 Vendor: Intel (0x8086) Device ID: 0x0046 Revision ID: 0x0018 gMux Version: 1.9.22 NVIDIA GeForce GT 330M: Chipset Model: NVIDIA GeForce GT 330M Type: GPU Bus: PCIe PCIe Lane Width: x16 VRAM (Total): 512 MB Vendor: NVIDIA (0x10de) Device ID: 0x0a29 Revision ID: 0x00a2 ROM Revision: 3560 gMux Version: 1.9.22 Displays: Color LCD: Display Type: LCD Resolution: 1600 x 1000 Pixel Depth: 32-Bit Color (ARGB8888) Main Display: Yes Mirror: Off Online: Yes Built-In: Yes
Things that seemed to help
These are taken from the answers below (thanks!), read them for details
I had some unusual cpu usage after upgrading to yosemite, I followed 6 Easy Tips to Speed Up OS X Yosemite on Your Mac (first one helped alot).
I disabled hardware acceleration in chrome
I enabled subpixel font rendering for non-Apple LCDs:
defaults write NSGlobalDomain AppleFontSmoothing -int 2