Optimizing Shader Compiler for HDRP

Working with a large project using HDRP and the shader compilation process takes an hour or two to complete...

This is fast becoming a huge pain to work with as each build requires it and each upgrade to a new major version number (e.g 2019.1 - 2019.2) runs the process...

Shader varients have been saved into an asset with no noticable difference to the time taken at all : https://docs.unity3d.com/Manual/OptimizingShaderLoadTime.html

Is there anything that can be done to increase the speed of this process or is this a limitation to working with HDRP on a full scale project?