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Both Safari and Chrome are running like dogs on my Mac all of a sudden - command T to open a new tab is taking 15 plus seconds and giving me the beach ball. 15 seconds to open a new STW tab.
Other apps seem fine, Speedtest reports 24ms ping and 6.2mb download speed. Seems snappy enough on my iPad
I've not knowingly installed anything new.
Load activity monitor and look at memory pressure, is your disk fairly full ? Sounds to me like recourse constraints on the machine for the new tab. I am guessing opening a new page in am existing tab is fine. Do you have a lot of programmes running ?
clear browser caches
give your p ram a zap
give your p ram a zap
??
A reboot seems to have solved it for now. (thought I'd tried that and it hadn't made a difference)
I do notice that occasionally a few system tasks seem to decide to use up all the CPU when using just Safari ( WindowServer and com.Apple.Webkit). I just kill their processes and let them restart, which seems to fix it.
Time Machine sends Safari into treacle running mode on my Mac.
[url= http://www.macworld.com/article/2881177/how-to-reset-your-macs-nvram-pram-and-smc.html ]How to zap the nvram (or pram)[/url]
I've not knowingly installed anything new.
I don't use Safari or Chrome on my mac but instead use Firefox. Upgraded last Wednesday and it crashed when connecting an HDMI lead that evening.
Since then I've had some strange behaviour on user login. Reading the crash log lead me to checking the browser add-ons and I found Widevine Content Decryption Module had been installed and, bizarrely, Flash Player had been activated. Disabled both and everything is fine again. Might be worth checking if you're still having issues.