I have always installed the security update, then after restart installed the Safari update.
I never let both install together.
Safari 14 was installed just after su4 with no issue (that I can see).
Is it Safari 14 causing this?
This will only work if you applied the update less than 24 hours.
I just reverted Mojave back to macOS 10.14.6 (18G103). Safari is at Version 14.0 (14610.1.28.1.9). No problems with memory usage with this pairing. Just not going to install any more Mojave updates until Apple acknowledges the issue on their end. It's clearly in the Mojave update. I only reinstalled Mojave, I did not install any Safari updates.
I just reverted Mojave back to macOS 10.14.6 (18G103). Safari is at Version 14.0 (14610.1.28.1.9). No problems with memory usage with this pairing. Just not going to install any more Mojave updates until Apple acknowledges the issue on their end. It's clearly in the Mojave update. I only reinstalled Mojave, I did not install any Safari updates.
I realize that there is a good chance that we're complaining into the void, or just being ignored because Apple considers Mojave to be a legacy product, even if they won't say so. However, the only chance that Apple will hear us is using the feedback system, not any forum, as helpful as MacRumors is. I'd suggest sending in as many detailed complaints as you can; there's some chance that Apple Support will listen if they get enough flack over this.
Apple macOS Feedback
Colstan
I did this the first day I reported it here. No replies so far.
Also somewhat sad is the mother site here doesn't even acknowledge that there WAS a Security Update 005
After reading Pierrespartan's last post I decided to try adding Safari 14 to my last posting. I installed it - and not SU 005, ran Onyx and rebooted. I'm now on 10.14.6, 18G6020, Security Update 004, Safari 14.0. Imazing, Little Snitch, Micro Snitch, Malwarebytes, TG Pro, Memory Cleaner, VPN and Brave browser running. 33% memory usage (5 of 16GB) according to Memory Cleaner. Opened Safari and memory usage went to 35%. I'm giving you the evil eye Security Update 005.
I realize that there is a good chance that we're complaining into the void, or just being ignored because Apple considers Mojave to be a legacy product, even if they won't say so. However, the only chance that Apple will hear us is using the feedback system, not any forum, as helpful as MacRumors is. I'd suggest sending in as many detailed complaints as you can; there's some chance that Apple Support will listen if they get enough flack over this.
Apple macOS Feedback
Colstan
objc[1050]: Class AMSupportURLConnectionDelegate is implemented in both /System/Library/PrivateFrameworks/EmbeddedOSInstall.framework/Versions/A/EmbeddedOSInstall (0x11780bc58) and /System/Library/PrivateFrameworks/OSPersonalization.framework/Versions/A/OSPersonalization (0x11766e358). One of the two will be used. Which one is undefined.