diff --git a/datamodel/low/v3/components.go b/datamodel/low/v3/components.go
index a53534e..31e878b 100644
--- a/datamodel/low/v3/components.go
+++ b/datamodel/low/v3/components.go
@@ -39,6 +39,7 @@ func (co *Components) FindExtension(ext string) *low.ValueReference[any] {
 // FindSchema attempts to locate a SchemaProxy from 'schemas' with a specific name
 func (co *Components) FindSchema(schema string) *low.ValueReference[*base.SchemaProxy] {
 	return low.FindItemInMap[*base.SchemaProxy](schema, co.Schemas.Value)
+
 }
 
 // FindResponse attempts to locate a Response from 'responses' with a specific name
diff --git a/what-changed/model/comparison_functions.go b/what-changed/model/comparison_functions.go
index 84caeae..7325559 100644
--- a/what-changed/model/comparison_functions.go
+++ b/what-changed/model/comparison_functions.go
@@ -8,6 +8,7 @@ import (
 	"github.com/pb33f/libopenapi/datamodel/low"
 	"gopkg.in/yaml.v3"
 	"strings"
+	"sync"
 )
 
 const (
@@ -184,74 +185,8 @@ func CheckForModification[T any](l, r *yaml.Node, label string, changes *[]*Chan
 func CheckMapForChanges[T any, R any](expLeft, expRight map[low.KeyReference[string]]low.ValueReference[T],
 	changes *[]*Change, label string, compareFunc func(l, r T) R) map[string]R {
 
-	lHashes := make(map[string]string)
-	rHashes := make(map[string]string)
-	lValues := make(map[string]low.ValueReference[T])
-	rValues := make(map[string]low.ValueReference[T])
-
-	for k := range expLeft {
-		lHashes[k.Value] = low.GenerateHashString(expLeft[k].Value)
-		lValues[k.Value] = expLeft[k]
-	}
-
-	for k := range expRight {
-		rHashes[k.Value] = low.GenerateHashString(expRight[k].Value)
-		rValues[k.Value] = expRight[k]
-	}
-
-	expChanges := make(map[string]R)
-
-	checkLeft := func(k string, doneChan chan bool, f, g map[string]string, p, h map[string]low.ValueReference[T]) {
-		rhash := g[k]
-		if rhash == "" {
-			if p[k].GetValueNode().Value == "" {
-				p[k].GetValueNode().Value = k
-			}
-			CreateChange(changes, ObjectRemoved, label,
-				p[k].GetValueNode(), nil, true,
-				p[k].GetValue(), nil)
-			doneChan <- true
-			return
-		}
-		if f[k] == g[k] {
-			doneChan <- true
-			return
-		}
-		// run comparison.
-		expChanges[k] = compareFunc(p[k].Value, h[k].Value)
-		doneChan <- true
-	}
-
-	doneChan := make(chan bool)
-	count := 0
-
-	// check left example hashes
-	for k := range lHashes {
-		count++
-		go checkLeft(k, doneChan, lHashes, rHashes, lValues, rValues)
-	}
-
-	//check right example hashes
-	for k := range rHashes {
-		count++
-		go checkRightValue(k, doneChan, lHashes, rValues, changes, label)
-	}
-
-	// wait for all done signals.
-	completed := 0
-	for completed < count {
-		select {
-		case <-doneChan:
-			completed++
-		}
-	}
-	return expChanges
-}
-
-// CheckMapForChangesUntyped checks a left and right low level map for any additions, subtractions or modifications to
-// values. The compareFunc  can be generic and accept any type
-func CheckMapForChangesUntyped[T any, R any](expLeft, expRight map[low.KeyReference[string]]low.ValueReference[T],
-	changes *[]*Change, label string, compareFunc func(l, r any) R) map[string]R {
+	// stop concurrent threads screwing up changes.
+	var chLock sync.Mutex
 
 	lHashes := make(map[string]string)
 	rHashes := make(map[string]string)
@@ -276,9 +211,11 @@ func CheckMapForChangesUntyped[T any, R any](expLeft, expRight map[low.KeyRefere
 			if p[k].GetValueNode().Value == "" {
 				p[k].GetValueNode().Value = k
 			}
+			chLock.Lock()
 			CreateChange(changes, ObjectRemoved, label,
 				p[k].GetValueNode(), nil, true,
 				p[k].GetValue(), nil)
+			chLock.Unlock()
 			doneChan <- true
 			return
 		}
@@ -303,7 +240,7 @@ func CheckMapForChangesUntyped[T any, R any](expLeft, expRight map[low.KeyRefere
 	//check right example hashes
 	for k := range rHashes {
 		count++
-		go checkRightValue(k, doneChan, lHashes, rValues, changes, label)
+		go checkRightValue(k, doneChan, lHashes, rValues, changes, label, &chLock)
 	}
 
 	// wait for all done signals.
@@ -317,17 +254,88 @@ func CheckMapForChangesUntyped[T any, R any](expLeft, expRight map[low.KeyRefere
 	return expChanges
 }
 
+//// CheckMapForChangesUntyped checks a left and right low level map for any additions, subtractions or modifications to
+//// values. The compareFunc  can be generic and accept any type
+//func CheckMapForChangesUntyped[T any, R any](expLeft, expRight map[low.KeyReference[string]]low.ValueReference[T],
+//	changes *[]*Change, label string, compareFunc func(l, r any) R) map[string]R {
+//
+//	lHashes := make(map[string]string)
+//	rHashes := make(map[string]string)
+//	lValues := make(map[string]low.ValueReference[T])
+//	rValues := make(map[string]low.ValueReference[T])
+//
+//	for k := range expLeft {
+//		lHashes[k.Value] = low.GenerateHashString(expLeft[k].Value)
+//		lValues[k.Value] = expLeft[k]
+//	}
+//
+//	for k := range expRight {
+//		rHashes[k.Value] = low.GenerateHashString(expRight[k].Value)
+//		rValues[k.Value] = expRight[k]
+//	}
+//
+//	expChanges := make(map[string]R)
+//
+//	checkLeft := func(k string, doneChan chan bool, f, g map[string]string, p, h map[string]low.ValueReference[T]) {
+//		rhash := g[k]
+//		if rhash == "" {
+//			if p[k].GetValueNode().Value == "" {
+//				p[k].GetValueNode().Value = k // yes, a dirty thing, but it's clean for the consumer.
+//			}
+//			CreateChange(changes, ObjectRemoved, label,
+//				p[k].GetValueNode(), nil, true,
+//				p[k].GetValue(), nil)
+//			doneChan <- true
+//			return
+//		}
+//		if f[k] == g[k] {
+//			doneChan <- true
+//			return
+//		}
+//		// run comparison.
+//		expChanges[k] = compareFunc(p[k].Value, h[k].Value)
+//		doneChan <- true
+//	}
+//
+//	doneChan := make(chan bool)
+//	count := 0
+//
+//	// check left example hashes
+//	for k := range lHashes {
+//		count++
+//		go checkLeft(k, doneChan, lHashes, rHashes, lValues, rValues)
+//	}
+//
+//	//check right example hashes
+//	for k := range rHashes {
+//		count++
+//		go checkRightValue(k, doneChan, lHashes, rValues, changes, label)
+//	}
+//
+//	// wait for all done signals.
+//	completed := 0
+//	for completed < count {
+//		select {
+//		case <-doneChan:
+//			completed++
+//		}
+//	}
+//	return expChanges
+//}
+
 func checkRightValue[T any](k string, doneChan chan bool, f map[string]string, p map[string]low.ValueReference[T],
-	changes *[]*Change, label string) {
+	changes *[]*Change, label string, lock *sync.Mutex) {
 
 	lhash := f[k]
 	if lhash == "" {
 		if p[k].GetValueNode().Value == "" {
-			p[k].GetValueNode().Value = k
+			p[k].GetValueNode().Value = k // this is kinda dirty, but I don't want to duplicate code so sue me.
 		}
+		lock.Lock()
 		CreateChange(changes, ObjectAdded, label,
 			nil, p[k].GetValueNode(), false,
 			nil, p[k].GetValue())
+		lock.Unlock()
 	}
 	doneChan <- true
 }
diff --git a/what-changed/model/components.go b/what-changed/model/components.go
index 960db69..d49b8a1 100644
--- a/what-changed/model/components.go
+++ b/what-changed/model/components.go
@@ -4,6 +4,7 @@
 package model
 
 import (
+	"github.com/pb33f/libopenapi/datamodel/low"
 	v2 "github.com/pb33f/libopenapi/datamodel/low/v2"
 	v3 "github.com/pb33f/libopenapi/datamodel/low/v3"
 	"reflect"
@@ -14,7 +15,7 @@ type ComponentsChanges struct {
 	SchemaChanges         map[string]*SchemaChanges
 	ResponsesChanges      map[string]*ResponseChanges
 	ParameterChanges      map[string]*ParameterChanges
-	ExamplesChanges       map[string]*ExamplesChanges
+	ExamplesChanges       map[string]*ExampleChanges
 	RequestBodyChanges    map[string]*RequestBodyChanges
 	HeaderChanges         map[string]*HeaderChanges
 	SecuritySchemeChanges map[string]*SecuritySchemeChanges
@@ -34,8 +35,8 @@ func CompareComponents(l, r any) *ComponentsChanges {
 		reflect.TypeOf(&v2.ParameterDefinitions{}) == reflect.TypeOf(r) {
 		lDef := l.(*v2.ParameterDefinitions)
 		rDef := r.(*v2.ParameterDefinitions)
-		cc.ParameterChanges = CheckMapForChangesUntyped(lDef.Definitions, rDef.Definitions, &changes,
-			v3.ParametersLabel, CompareParameters)
+		cc.ParameterChanges = CheckMapForChanges(lDef.Definitions, rDef.Definitions, &changes,
+			v3.ParametersLabel, CompareParametersV2)
 	}
 
 	// Swagger Responses
@@ -43,8 +44,8 @@ func CompareComponents(l, r any) *ComponentsChanges {
 		reflect.TypeOf(&v2.ResponsesDefinitions{}) == reflect.TypeOf(r) {
 		lDef := l.(*v2.ResponsesDefinitions)
 		rDef := r.(*v2.ResponsesDefinitions)
-		cc.ResponsesChanges = CheckMapForChangesUntyped(lDef.Definitions, rDef.Definitions, &changes,
-			v3.ResponsesLabel, CompareResponse)
+		cc.ResponsesChanges = CheckMapForChanges(lDef.Definitions, rDef.Definitions, &changes,
+			v3.ResponsesLabel, CompareResponseV2)
 	}
 
 	// Swagger Schemas
@@ -61,8 +62,121 @@ func CompareComponents(l, r any) *ComponentsChanges {
 		reflect.TypeOf(&v2.SecurityDefinitions{}) == reflect.TypeOf(r) {
 		lDef := l.(*v2.SecurityDefinitions)
 		rDef := r.(*v2.SecurityDefinitions)
-		cc.SecuritySchemeChanges = CheckMapForChangesUntyped(lDef.Definitions, rDef.Definitions, &changes,
-			v3.SecurityDefinitionLabel, CompareSecuritySchemes)
+		cc.SecuritySchemeChanges = CheckMapForChanges(lDef.Definitions, rDef.Definitions, &changes,
+			v3.SecurityDefinitionLabel, CompareSecuritySchemesV2)
+	}
+
+	// OpenAPI Components
+	if reflect.TypeOf(&v3.Components{}) == reflect.TypeOf(l) &&
+		reflect.TypeOf(&v3.Components{}) == reflect.TypeOf(r) {
+
+		lComponents := l.(*v3.Components)
+		rComponents := r.(*v3.Components)
+
+		doneChan := make(chan componentComparison)
+		comparisons := 0
+
+		// run as fast as we can, thread all the things.
+		if !lComponents.Schemas.IsEmpty() || rComponents.Schemas.IsEmpty() {
+			comparisons++
+			go runComparison(lComponents.Schemas.Value, rComponents.Schemas.Value,
+				&changes, v3.SchemasLabel, CompareSchemas, doneChan)
+		}
+
+		if !lComponents.Responses.IsEmpty() || rComponents.Responses.IsEmpty() {
+			comparisons++
+			go runComparison(lComponents.Responses.Value, rComponents.Responses.Value,
+				&changes, v3.ResponsesLabel, CompareResponseV3, doneChan)
+		}
+
+		if !lComponents.Parameters.IsEmpty() || rComponents.Parameters.IsEmpty() {
+			comparisons++
+			go runComparison(lComponents.Parameters.Value, rComponents.Parameters.Value,
+				&changes, v3.ParametersLabel, CompareParametersV3, doneChan)
+		}
+
+		if !lComponents.Examples.IsEmpty() || rComponents.Examples.IsEmpty() {
+			comparisons++
+			go runComparison(lComponents.Examples.Value, rComponents.Examples.Value,
+				&changes, v3.ExamplesLabel, CompareExamples, doneChan)
+		}
+
+		if !lComponents.RequestBodies.IsEmpty() || rComponents.RequestBodies.IsEmpty() {
+			comparisons++
+			go runComparison(lComponents.RequestBodies.Value, rComponents.RequestBodies.Value,
+				&changes, v3.RequestBodiesLabel, CompareRequestBodies, doneChan)
+		}
+
+		if !lComponents.Headers.IsEmpty() || rComponents.Headers.IsEmpty() {
+			comparisons++
+			go runComparison(lComponents.Headers.Value, rComponents.Headers.Value,
+				&changes, v3.HeadersLabel, CompareHeadersV3, doneChan)
+		}
+
+		if !lComponents.SecuritySchemes.IsEmpty() || rComponents.SecuritySchemes.IsEmpty() {
+			comparisons++
+			go runComparison(lComponents.SecuritySchemes.Value, rComponents.SecuritySchemes.Value,
+				&changes, v3.SecuritySchemesLabel, CompareSecuritySchemesV3, doneChan)
+		}
+
+		if !lComponents.Links.IsEmpty() || rComponents.Links.IsEmpty() {
+			comparisons++
+			go runComparison(lComponents.Links.Value, rComponents.Links.Value,
+				&changes, v3.LinksLabel, CompareLinks, doneChan)
+		}
+
+		if !lComponents.Callbacks.IsEmpty() || rComponents.Callbacks.IsEmpty() {
+			comparisons++
+			go runComparison(lComponents.Callbacks.Value, rComponents.Callbacks.Value,
+				&changes, v3.CallbacksLabel, CompareCallback, doneChan)
+		}
+
+		cc.ExtensionChanges = CompareExtensions(lComponents.Extensions, rComponents.Extensions)
+
+		completedComponents := 0
+		for completedComponents < comparisons {
+			select {
+			case res := <-doneChan:
+				switch res.prop {
+				case v3.SchemasLabel:
+					completedComponents++
+					cc.SchemaChanges = res.result.(map[string]*SchemaChanges)
+					break
+				case v3.ResponsesLabel:
+					completedComponents++
+					cc.ResponsesChanges = res.result.(map[string]*ResponseChanges)
+					break
+				case v3.ParametersLabel:
+					completedComponents++
+					cc.ParameterChanges = res.result.(map[string]*ParameterChanges)
+					break
+				case v3.ExamplesLabel:
+					completedComponents++
+					cc.ExamplesChanges = res.result.(map[string]*ExampleChanges)
+					break
+				case v3.RequestBodiesLabel:
+					completedComponents++
+					cc.RequestBodyChanges = res.result.(map[string]*RequestBodyChanges)
+					break
+				case v3.HeadersLabel:
+					completedComponents++
+					cc.HeaderChanges = res.result.(map[string]*HeaderChanges)
+					break
+				case v3.SecuritySchemesLabel:
+					completedComponents++
+					cc.SecuritySchemeChanges = res.result.(map[string]*SecuritySchemeChanges)
+					break
+				case v3.LinksLabel:
+					completedComponents++
+					cc.LinkChanges = res.result.(map[string]*LinkChanges)
+					break
+				case v3.CallbacksLabel:
+					completedComponents++
+					cc.CallbackChanges = res.result.(map[string]*CallbackChanges)
+					break
+				}
+			}
+		}
 	}
 
 	cc.Changes = changes
@@ -72,6 +186,20 @@ func CompareComponents(l, r any) *ComponentsChanges {
 	return cc
 }
 
+type componentComparison struct {
+	prop   string
+	result any
+}
+
+// run a generic comparison in a thread which in turn splits checks into further threads.
+func runComparison[T any, R any](l, r map[low.KeyReference[string]]low.ValueReference[T],
+	changes *[]*Change, label string, compareFunc func(l, r T) R, doneChan chan componentComparison) {
+	doneChan <- componentComparison{
+		prop:   label,
+		result: CheckMapForChanges(l, r, changes, label, compareFunc),
+	}
+}
+
 func (c *ComponentsChanges) TotalChanges() int {
 	v := c.PropertyChanges.TotalChanges()
 	for k := range c.SchemaChanges {
diff --git a/what-changed/model/parameter.go b/what-changed/model/parameter.go
index b1c6247..0f36c99 100644
--- a/what-changed/model/parameter.go
+++ b/what-changed/model/parameter.go
@@ -191,6 +191,14 @@ func addCommonParameterProperties(left, right low.SharedParameters, changes *[]*
 	return props
 }
 
+func CompareParametersV3(l, r *v3.Parameter) *ParameterChanges {
+	return CompareParameters(l, r)
+}
+
+func CompareParametersV2(l, r *v2.Parameter) *ParameterChanges {
+	return CompareParameters(l, r)
+}
+
 func CompareParameters(l, r any) *ParameterChanges {
 
 	var changes []*Change
diff --git a/what-changed/model/security_scheme.go b/what-changed/model/security_scheme.go
index 347422e..8a40a2b 100644
--- a/what-changed/model/security_scheme.go
+++ b/what-changed/model/security_scheme.go
@@ -44,6 +44,14 @@ func (ss *SecuritySchemeChanges) TotalBreakingChanges() int {
 	return c
 }
 
+func CompareSecuritySchemesV2(l, r *v2.SecurityScheme) *SecuritySchemeChanges {
+	return CompareSecuritySchemes(l, r)
+}
+
+func CompareSecuritySchemesV3(l, r *v3.SecurityScheme) *SecuritySchemeChanges {
+	return CompareSecuritySchemes(l, r)
+}
+
 func CompareSecuritySchemes(l, r any) *SecuritySchemeChanges {
 
 	var props []*PropertyCheck