Optimized some slow parts of the engine.

Last low hanging fruit: parsing is slow, cache parsed calculations

app/imports/api/simpleSchemaConfig.js

@@ -1,3 +1,30 @@
 import SimpleSchema from 'simpl-schema';
 
-SimpleSchema.extendOptions(['parseLevel']);
+SimpleSchema.extendOptions([
+  'parseLevel',
+  'removeBeforeCompute',
+  'inlineCalculationField',
+  'computedField',
+]);
+
+// Store a quick way of referencing keys that have specific tags === true
+function storeTaggedKeys(tag, fnName){
+  SimpleSchema.prototype[fnName] = function(){
+    if (!this['_' + fnName]){
+      this['_' + fnName] = [];
+      for (const key in this._schema){
+        if (this._schema[key][tag]){
+          this['_' + fnName].push(key);
+        }
+      }
+    }
+    return this['_' + fnName];
+  }
+}
+
+// Keys that should be deleted at the start of a computation
+storeTaggedKeys('removeBeforeCompute', 'removeBeforeComputeFields');
+// Keys that represent inline calculation objects
+storeTaggedKeys('inlineCalculationField', 'inlineCalculationFields');
+// Keys that represent computed field objects
+storeTaggedKeys('computedField', 'computedFields');