There appears to be a
performance issue when accessing
https://www.netflix.com/browse when AdBlock Plus is installed and the about:addons shows AdBlock Plus as enabled.
System:
Windows 7 Home Premium SP1 (64-bit)
AMD A6-3620 APU with Radeon(tm) HD Graphics 2.20 GHz
RAM: 8 GB
Browser:
Firefox 53.0.3 (64-bit)
multi-processing is enabled.
Extensions: AdBlock Plus 2.8.2
Adblock Plus subscriptions:
- EasyList
- Adblock Warning Removal List
[x] Allow some non-intrusive advertising
To reproduce
Start with a brand new profile. Dismiss the page about logging on to Mozilla.
In about:addons, add an add-on called "AdBlock Plus". Verify that lists "AdBlock Warning Removal List" and "EasyList" are present in the Filter Preferences.
Navigate to any simple page, such as
www.hotboots.com. No issues.
Navigate to
https://www.netflix.com and logon as needed (will be needed the first time for a new profile). When redirected to
https://www.netflix.com/browse the page will freeze, the CPU will hit 25% or slightly more (equivalent of saturating a core of this 4-core CPU), and will stay there between 32 and 53 seconds. Then the page will become responsive. Do a page refresh, and the page will be frozen for another 32 to 53 seconds.
If I open another tab, and key in about:performance, the performance page shows that when
https://www.netflix.com/browse refreshes that the Adblock Plus is using 61% of the CPU and the about:performance tab is using 20%. (which is odd; 61% + 20% = the 35% that Windows Task Manager is showing me?) Then after whatever it is that is grabbing the CPU cycles and the page has finished refreshing, Adblock Plus settles down to 1% of the CPU.
This is a typical report after one such session:
https://reports.adblockplus.org/b24eab9 ... 6231844be4
If I click on the AdBlock Plus icon and disable on netflix.com, then navigate to
https://www.netflix.com I still get the CPU load for about the same amount of time. This is a typical report with AdBlock Plus configured to be disabled on netflix.com:
https://reports.adblockplus.org/b046166 ... f02477afd3
For what it's worth, when using Chrome 58.0.3029.110 (64-bit) with AdBlock Plus the CPU is pegged a bit north of 25% for only about 5 seconds, and the Chrome Task Manager shows AdBlock Plus peaking at 2.7% (when AdBlock Plus is set to "disable on netflix.com") and the tab for Netflix peaking at about 32%. These numbers are probably reasonable, considering the amount of junk
https://www.netflix.com/browse drags in to produce all those customized suggestions.