I'm having trouble replicating this issue. My CPU usage stays around 2-4% on a tab (including ads). Do you know exactly what page you were on when this happened, or was it just a normal MF page like the front page?

Thanks to Hoppermh for the sig!
Granted, this does not happen on the front page.
But try viewing this Annie guide for example: https://www.mobafire.com/league-of-legends/build/7-24-annie-reforged-fallen3s-guide-to-annie-505449
In my case viewing it consistently results in a high CPU usage.
Viewing the list of Annie guides: https://www.mobafire.com/league-of-legends/champion/annie-1 also results in a high CPU usage for me, however, not as high as above.
Oddly viewing another Annie guide: https://www.mobafire.com/league-of-legends/build/found-him-pre-season-8-annie-guide-469306 results in an acceptable CPU usage, even lower than the one associated with viewing the list of Annie guides.
But try viewing this Annie guide for example: https://www.mobafire.com/league-of-legends/build/7-24-annie-reforged-fallen3s-guide-to-annie-505449
In my case viewing it consistently results in a high CPU usage.
Viewing the list of Annie guides: https://www.mobafire.com/league-of-legends/champion/annie-1 also results in a high CPU usage for me, however, not as high as above.
Oddly viewing another Annie guide: https://www.mobafire.com/league-of-legends/build/found-him-pre-season-8-annie-guide-469306 results in an acceptable CPU usage, even lower than the one associated with viewing the list of Annie guides.
Thanks for the details. Unfortunately (or fortunately for me I guess) I only get up to about 16% usage at most on that page. Could be a specific ad you're getting, unless this issue is intermittent and you don't get the same problem every time you load the page.
We'll look into this but it might be hard to fix if we can't replicate the problem.
We'll look into this but it might be hard to fix if we can't replicate the problem.

Thanks to The_Nameless_Bard for the sig!
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unless this issue is intermittent and you don't get the same problem every time you load the page.
I'm sorry, every time I visit this page with Firefox I get this issue.
Tried MS Edge. OK CPU consumption on both Annie guides. However, viewing the list of Annie guides: https://www.mobafire.com/league-of-legends/champion/annie-1 results in a moderately too high CPU usage on Edge as well as on Firefox.
Is there any other info I can provide?
OK, for some reason, I once manager to enter this dreaded guide on Firefox and not get an abnormally high CPU usage. I usually browse with private mode on - this time for testing I took it off. However, this result is not consistent: I managed to view this page w/o an abnormally high CPU usage ONCE with private mode off as opposed to many failed attempts with private mode on and off.
kmph wrote:
Granted, this does not happen on the front page.
But try viewing this Annie guide for example: https://www.mobafire.com/league-of-legends/build/7-24-annie-reforged-fallen3s-guide-to-annie-505449
In my case viewing it consistently results in a high CPU usage.
Viewing the list of Annie guides: https://www.mobafire.com/league-of-legends/champion/annie-1 also results in a high CPU usage for me, however, not as high as above.
Oddly viewing another Annie guide: https://www.mobafire.com/league-of-legends/build/found-him-pre-season-8-annie-guide-469306 results in an acceptable CPU usage, even lower than the one associated with viewing the list of Annie guides.
But try viewing this Annie guide for example: https://www.mobafire.com/league-of-legends/build/7-24-annie-reforged-fallen3s-guide-to-annie-505449
In my case viewing it consistently results in a high CPU usage.
Viewing the list of Annie guides: https://www.mobafire.com/league-of-legends/champion/annie-1 also results in a high CPU usage for me, however, not as high as above.
Oddly viewing another Annie guide: https://www.mobafire.com/league-of-legends/build/found-him-pre-season-8-annie-guide-469306 results in an acceptable CPU usage, even lower than the one associated with viewing the list of Annie guides.
Hey, I have made some changes to the auto-play of the video clips in the Annie Guide that you mentioned.
Would be interested to see if the performance has improved a bit for you.
Out of interest, what CPU and how much RAM do you have?
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Would be interested to see if the performance has improved a bit for you.
Yes, I can now read yuor guide with normal CPU usage and without the noise from my laptop's fans :) Thank you!
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Out of interest, what CPU and how much RAM do you have?
ASUS R556L is my laptop. According to the task manager I have Intel Core i5-5200U CPU @ 2.20 GHZ, 2 cores. RAM 4.0 GB DDR3, speed 1600MHz.
It's not a high-end laptop for sure, but it's capable of playing LoL on highest settings.
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I assure you, I had ONLY a MobaFire tab in Firefox on at the moment of taking this screenshot.
SOmetimes I was seeing a MobaFire Firefox tab taking 100% RAM as well.