I always have the problem of big CPU consumption with my Gmail box. I noticed that both Iceweasel and Icedove after an half hour of use are stuck around 27-30% of cpu usage. Icedove has better performance than Iceweasel because this last with other many tabs open the cpu usage can reach an average of 50-60%. Pretty bored and frustrated about this situation I remembered the new Gnome Web (Epiphany for the older friends) can create web app so I thought maybe I could I do a try...
I opened for a short time Iceweasel with 1 tab, Icedove and eventually Gmail Web app. No one other application were running during every tests, so this is the result:
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PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
12345 XXXXX 20 0 1429780 488108 88424 S 14,5 8,6 1:58.99 iceweasel
12345 XXXXX 20 0 1120568 335868 86812 S 8,6 5,9 1:07.47 icedove
12345 XXXXX 20 0 2354164 102036 53576 S 1,2 1,8 1:44.54 epiphany
I'll let you know if also Epiphany is going to have any cpu usage issue after a long session!
UPDATING
After starting using normally the web apps this is the current status:
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PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
12345 XXXXX 20 0 3648140 479216 86888 R 59,3 8,4 7:09.77 WebKitWebProces
12345 XXXXX 20 0 2642192 104292 53776 S 34,5 1,8 3:25.52 epiphany
UPDATING 02
I received 4 emails from Indeed.com and I began to have this consumption after reviewed and deleted those emails the cpu usage is returned nice. Where the indeed emails digging in my mailbox with all their crappy trackers?