Performance optimizations

[luigikav]

Pull request checklist

• Did you bump the project version?
• Did you add a description to the Pull Request?
• Did you add new tests?
• Did you add reviewers?

[codecov-commenter]

Codecov Report

❌ Patch coverage is 98.44098% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.03%. Comparing base (1d483a7) to head (47adf0b).

Files with missing lines	Patch %	Lines
src/context.jl	83.33%	3 Missing ⚠️
src/compiler.jl	98.21%	2 Missing ⚠️
src/eval.jl	94.11%	1 Missing ⚠️
src/vm.jl	99.61%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #36      +/-   ##
==========================================
+ Coverage   90.30%   97.03%   +6.73%     
==========================================
  Files           4        8       +4     
  Lines         330      777     +447     
==========================================
+ Hits          298      754     +456     
+ Misses         32       23       -9     

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