[perf] more latency improvements

[odow]

Current flame graphs

clp

clp --no-bridge

glpk

glpk --no-bridge

[odow]

(base) oscar@Oscars-MBP time_to_first_solve % ~/julia --project=. script.jl clp
Running: clp 
 10.363394 seconds (26.19 M allocations: 1.613 GiB, 5.14% gc time, 17.97% compilation time)
  0.001227 seconds (3.39 k allocations: 283.031 KiB)
(base) oscar@Oscars-MBP time_to_first_solve % ~/julia --project=. script.jl clp --no-bridge
Running: clp --no-bridge
  4.602488 seconds (9.73 M allocations: 608.035 MiB, 5.26% gc time, 36.07% compilation time)
  0.000975 seconds (2.40 k allocations: 220.969 KiB)
(base) oscar@Oscars-MBP time_to_first_solve % ~/julia --project=. script.jl glpk           
Running: glpk 
  6.213895 seconds (17.02 M allocations: 1.000 GiB, 6.50% gc time, 33.05% compilation time)
  0.000709 seconds (1.22 k allocations: 84.094 KiB)
(base) oscar@Oscars-MBP time_to_first_solve % ~/julia --project=. script.jl glpk --no-bridge
Running: glpk --no-bridge
  3.591586 seconds (5.62 M allocations: 330.261 MiB, 4.28% gc time, 99.95% compilation time)
  0.000370 seconds (655 allocations: 65.297 KiB)