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Hi @Daniel_Kavan,

Regarding your statement:
CUT>>>
CPVIEW CPU shows CoreXL_FW using 3 CPUs at 100%
CorXL_SND is using 2 @ 2%
<<<CUT

Exciting I find the distribution 2/3 🙂
This is not possible with a 4 core license.
If you have a 8 core license, not all cores are used and the default distribution should be 2/6.
I would clean up this first.

If you have a 4 core license, you should only use  - in your case - 1 x SND and  3 x CoreXL.
Problem is that you need to reduce the load on the CoreXL instances.
To do that, you need to reduce the PSL,PSLXL and CPAS traffic.
More here R8x - Security Gateway Architecture (Content Inspection).
This means, for example, less IPS, AntiBot,... analysis.
Here you can - for example - exclude internal networks from IPS, AntiBot, AV... unfortunately, this reduced the security level.

Sometimes you can also set the CPU itself to the highest clock speed in the BIOS. 
This also helps in some cases on a open server to have more CPU performance and thus more CoreXL performance.
More read here R8x - Performance Tuning Tip - BIOS.

Alternatively, you can buy a larger license (8 cores) and use a 2/6 distribution.

PS:
I would always install the latest Jumbo hotfix sk165456 at the moment R80.40 jumbo HF 118.