CPU spikes after plugin insert

This has been happening for awhile now, I can keep thinking a PT update will fix it and it doesn't. No difference in behavior from 12.1, 12.2, 12.3 or 12.3.1

The problem is that after I start inserting plugins on more than few tracks, I get very high CPU spikes, to the point that PT won't playback and I get the AAE -9173 error message. After a few seconds, things settle down and I can playback audio again.

Sometimes I'll get a CPU spike and I don't get that error message, but audio keeps playing and there is significant crackling/pops until the CPU spike settles. Not ideal.

Here's a video of a CPU from inserting a plugin:
http://ift.tt/1P7INjQ

Has anybody else had this kind of problem and was able to solve it? I don't remember this happening until late PT 11 or maybe with PT 12.

Computer Specs:

iMac 27" 3.5GHz i7
32GB RAM
Solid State Hard disk for OS (external SSDs for audio)
OSX 10.10.5 (happend on earlier OS versions too)

In one TB port, I have an OWC Thunderbolt 2 dock which feeds the Sonnet Echo Express III D containing my Lynx AES16e card, UAD Octo Card, and a FW/USB card that normally has nothing connected to it.

From there, I'm coming out of the Sonnet Echo Express to feed a Phillips TV as an extra display using a TB to HDMI cable. The OWC Thunderbolt 2 dock also feeds a 55" Samsung TV via the HDMI output which is used as my main display.

The other TB port is feeding a Blackmagic Multidock with the external SSDs.

The computer itself also has a few dongles for iLok, Steinberg key, and Weiss Saracon dongle.

Other peripherals include an Apple wired USB keyboard, Apple USB Superdrive, bluetooth Apple Magic Mouse.

I think that's it. Despite all this, I never hear the iMac fan kick on so I feel like the iMac can handle it, but when I'm working in Pro Tools and start inserting plugins on more than a couple tracks, I get a huge CPU spike for a few seconds and Pro Tools won't playback audio until the spike settles down. I get error message AAE -9173

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CPU spikes after plugin insert