Fix a performance problem with adding RVs

[davidanthoff]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 84.81%. Comparing base (1bdbc78) to head (333ac69).

Files	Patch %	Lines
src/mcs/montecarlo.jl	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #986      +/-   ##
==========================================
+ Coverage   84.77%   84.81%   +0.03%     
==========================================
  Files          40       40              
  Lines        4058     4062       +4     
==========================================
+ Hits         3440     3445       +5     
+ Misses        618      617       -1     

Flag	Coverage Δ
unittests	84.81% <83.33%> (+0.03%)	⬆️

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