Interestingly solves runtimes vary by orders of magnitude when new equations are added to it. Interestingly in one of the cases shown here when a larger more complex equation is added it runs orders of magnitude faster.
This graph shows the runtimes of solve on my laptop, as i pass it more members of a family of equations. Notably runtime jumps up by an order of magnitude at 4 but then reduces when i add the next equation, despite it being a much longer and more complex one 
The worksheet this is taken from ,where you can see all the arguments passed to solve is here.
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Understanding why solve takes different amounts of time for similar problems
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