I own a MacBook Pro 13" (early 2015). It has a dual-core i5 2,9GHz processor, 8go DDR3 RAM and 512Gb hard disk.

The computer performs well in general. I use it exclusively for web development. My memory usage is quite good, I have a memory pressure around 55% in general.

However, several times in a day my CPU hang up during heavy tasks:

* debugging,
* indexing in the IDE,
* database backup,
* and several other docker manipulations.

I was wondering if there is some way to increase my CPU power while working at office. 

I read about connecting the MBP to an iMac and booting it in "target disk mode". It appears I can run my system using the hardware of the iMac.

However, it looks like this is rarely used, and I didn't find some good user reports on using it.

So, some questions:

* Does it perform really well and really better ?
* Can I have a lost of performance because of the use of the thunderbolt port ?
* Is it safe ?
* Does sofwtare complains about switching from one system to another ?
* Are there any other alternatives ?
* Does the performance gain can be better than simply upgrading to an early MBP 15 inch ?