Silverlight and Flash player cuase CPU usage to 100 percent in a few seconds

[tsm012]

Hey guys I have a 20 inch imac (mid 2007) that i start having issues with. while watching videos with silverlight or flash i notice that the CPU usage will go up to 100 percent of system utilization within 15 seconds of starting the videos. the sites were hulu, netflix, and youtube. However i switched over to HTML 5 on youtube and now those videos play perfectly with no usage increases. i've uninstalled both flash and silverlight and reinstalled them and get the same result. Any advise?

 

[apraetor]

The HTML5-based videos play with minimal CPU load because they are being offloaded to the GPU for decoding, which is proper behavior. Silverlight and Flash SHOULD do the same, but for whatever reason I've never been able to induce it to do so. In Windows (via BootCamp or on a genuine PC) the decoding is offloaded properly, so this is an OS X-specific issue. You're going to have to live with it; on all Macbook Pros since 2011 this issue not only ties up the available CPU resources, but also, due to the power the CPU needs, actually drains the battery to augment the AC adapter -- and if Apple still hasn't tweaked the OS or upped the AC adapter capacity so that a $3k laptop performs like others at its' price-point.. well, you see what I'm getting at.