Update CompilerImprovements

CompilerImprovements.md

@@ -68,15 +68,28 @@ performance over each release.
         -   since each stage is separate but dependent, separate threads could work on a given thread
 
 
-I# Tunables to reduce memory
+# Tunables to reduce memory
 
-- O expr-simplify
-- O diff-encode
-- j 0
-- ensure parser is stripped
+* -O expr-simplify (may slow small policy compiles, will speed up large compiles)
+* -O diff-encode (will slow down small compiles slightly, will speed up large compiles)
+* -j N (will slow policy compiles that can happen in parallel)
+**  N=0 (no workers, everything done by driver, requires 3.0)
+**  N=1 (one worker)
+**  N=xC where C is less than the default of 8
+* --max-jobs=N (cap workers used by -j irrespective of number of cpus
+* ensure parser is stripped
+
+# Tunables to reduce policy size
+
+* -O minimize (may slow small policy compiles, will speed-up large compiles)
+* -O compress-small (will slow down compiles)
+* -O diff-encode (may slow small policy compiles, will speed-up large compiles)
 
 # Tunables to trade compiler memory for speed
 
+???
+
+
 # Improvements per Release
 
 -   2.1 DFA introduced