diff --git a/source/blender/blenkernel/BKE_node.h b/source/blender/blenkernel/BKE_node.h
index 0a2f757b38e..16d7ba8b090 100644
--- a/source/blender/blenkernel/BKE_node.h
+++ b/source/blender/blenkernel/BKE_node.h
@@ -737,8 +737,6 @@ void            ntreeGPUMaterialNodes(struct bNodeTree *ntree, struct GPUMateria
 
 /* API */
 struct CompBuf;
-struct bNodeTreeExec *ntreeCompositBeginExecTree(struct bNodeTree *ntree, int use_tree_data);
-void ntreeCompositEndExecTree(struct bNodeTreeExec *exec, int use_tree_data);
 void ntreeCompositExecTree(struct bNodeTree *ntree, struct RenderData *rd, int rendering, int do_previews,
                            const struct ColorManagedViewSettings *view_settings, const struct ColorManagedDisplaySettings *display_settings);
 void ntreeCompositTagRender(struct Scene *sce);
diff --git a/source/blender/blenkernel/intern/node.c b/source/blender/blenkernel/intern/node.c
index 84e280034ed..c73bd5ef8fd 100644
--- a/source/blender/blenkernel/intern/node.c
+++ b/source/blender/blenkernel/intern/node.c
@@ -1035,9 +1035,6 @@ void ntreeFreeTree_ex(bNodeTree *ntree, const short do_id_user)
 	 */
 	if (ntree->execdata) {
 		switch (ntree->type) {
-			case NTREE_COMPOSIT:
-				ntreeCompositEndExecTree(ntree->execdata, 1);
-				break;
 			case NTREE_SHADER:
 				ntreeShaderEndExecTree(ntree->execdata, 1);
 				break;
diff --git a/source/blender/nodes/composite/node_composite_tree.c b/source/blender/nodes/composite/node_composite_tree.c
index 7004b722bc9..a6592b47e87 100644
--- a/source/blender/nodes/composite/node_composite_tree.c
+++ b/source/blender/nodes/composite/node_composite_tree.c
@@ -51,7 +51,6 @@
 #include "BKE_tracking.h"
 
 #include "node_common.h"
-#include "node_exec.h"
 #include "node_util.h"
 
 #include "PIL_time.h"
@@ -268,92 +267,6 @@ bNodeTreeType ntreeType_Composite = {
 };
 
 
-/* XXX Group nodes must set use_tree_data to false, since their trees can be shared by multiple nodes.
- * If use_tree_data is true, the ntree->execdata pointer is checked to avoid multiple execution of top-level trees.
- */
-struct bNodeTreeExec *ntreeCompositBeginExecTree(bNodeTree *ntree, int use_tree_data)
-{
-	bNodeTreeExec *exec;
-	bNode *node;
-	bNodeSocket *sock;
-	
-	if (use_tree_data) {
-		/* XXX hack: prevent exec data from being generated twice.
-		 * this should be handled by the renderer!
-		 */
-		if (ntree->execdata)
-			return ntree->execdata;
-	}
-	
-	/* ensures only a single output node is enabled */
-	ntreeSetOutput(ntree);
-	
-	exec = ntree_exec_begin(ntree);
-	
-	for (node= exec->nodetree->nodes.first; node; node= node->next) {
-		/* initialize needed for groups */
-		node->exec= 0;
-		
-		for (sock= node->outputs.first; sock; sock= sock->next) {
-			bNodeStack *ns= node_get_socket_stack(exec->stack, sock);
-			if (ns && sock->cache) {
-				ns->data= sock->cache;
-				sock->cache= NULL;
-			}
-		}
-		/* cannot initialize them while using in threads */
-		if (ELEM4(node->type, CMP_NODE_TIME, CMP_NODE_CURVE_VEC, CMP_NODE_CURVE_RGB, CMP_NODE_HUECORRECT)) {
-			curvemapping_initialize(node->storage);
-			if (node->type==CMP_NODE_CURVE_RGB)
-				curvemapping_premultiply(node->storage, 0);
-		}
-	}
-	
-	if (use_tree_data) {
-		/* XXX this should not be necessary, but is still used for cmp/sha/tex nodes,
-		 * which only store the ntree pointer. Should be fixed at some point!
-		 */
-		ntree->execdata = exec;
-	}
-	
-	return exec;
-}
-
-/* XXX Group nodes must set use_tree_data to false, since their trees can be shared by multiple nodes.
- * If use_tree_data is true, the ntree->execdata pointer is checked to avoid multiple execution of top-level trees.
- */
-void ntreeCompositEndExecTree(bNodeTreeExec *exec, int use_tree_data)
-{
-	if (exec) {
-		bNodeTree *ntree= exec->nodetree;
-		bNode *node;
-		bNodeStack *ns;
-		
-		for (node= exec->nodetree->nodes.first; node; node= node->next) {
-			bNodeSocket *sock;
-			
-			for (sock= node->outputs.first; sock; sock= sock->next) {
-				ns = node_get_socket_stack(exec->stack, sock);
-				if (ns && ns->data) {
-					sock->cache= ns->data;
-					ns->data= NULL;
-				}
-			}
-			if (node->type==CMP_NODE_CURVE_RGB)
-				curvemapping_premultiply(node->storage, 1);
-			
-			node->need_exec= 0;
-		}
-	
-		ntree_exec_end(exec);
-		
-		if (use_tree_data) {
-			/* XXX clear nodetree backpointer to exec data, same problem as noted in ntreeBeginExecTree */
-			ntree->execdata = NULL;
-		}
-	}
-}
-
 void *COM_linker_hack = NULL;
 
 void ntreeCompositExecTree(bNodeTree *ntree, RenderData *rd, int rendering, int do_preview,
diff --git a/source/blender/nodes/composite/nodes/node_composite_common.c b/source/blender/nodes/composite/nodes/node_composite_common.c
index 4307232a41e..835c2b75aa4 100644
--- a/source/blender/nodes/composite/nodes/node_composite_common.c
+++ b/source/blender/nodes/composite/nodes/node_composite_common.c
@@ -38,179 +38,6 @@
 #include "node_common.h"
 #include "node_exec.h"
 
-#if 0
-static void PRINT_BUFFERS(bNodeTreeExec *exec)
-{
-	bNodeTree *ntree= exec->nodetree;
-	bNode *node;
-	bNodeSocket *sock;
-	bNodeStack *ns;
-	int i;
-	
-	printf("-------------- DEBUG --------------\n");
-	for (sock=ntree->inputs.first, i=0; sock; sock=sock->next, ++i) {
-		ns = node_get_socket_stack(exec->stack, sock);
-		printf("%d. Tree Input %s", i, sock->name);
-		if (ns->external)
-			printf(" (external)");
-		printf(": data=%p\n", ns->data);
-	}
-	for (sock=ntree->outputs.first, i=0; sock; sock=sock->next, ++i) {
-		ns = node_get_socket_stack(exec->stack, sock);
-		printf("%d. Tree Output %s", i, sock->name);
-		if (ns->external)
-			printf(" (external)");
-		printf(": data=%p\n", ns->data);
-	}
-	for (node=ntree->nodes.first; node; node=node->next) {
-		printf("Node %s:\n", node->name);
-		for (sock=node->inputs.first, i=0; sock; sock=sock->next, ++i) {
-			ns = node_get_socket_stack(exec->stack, sock);
-			printf("\t%d. Input %s", i, sock->name);
-			if (ns->external)
-				printf(" (external)");
-			printf(": data=%p\n", ns->data);
-		}
-		for (sock=node->outputs.first, i=0; sock; sock=sock->next, ++i) {
-			ns = node_get_socket_stack(exec->stack, sock);
-			printf("\t%d. Output %s", i, sock->name);
-			if (ns->external)
-				printf(" (external)");
-			printf(": data=%p\n", ns->data);
-		}
-	}
-}
-#endif
-
-static void copy_stack(bNodeStack *to, bNodeStack *from)
-{
-	if (to != from) {
-		copy_v4_v4(to->vec, from->vec);
-		to->data = from->data;
-		to->datatype = from->datatype;
-
-		/* tag as copy to prevent freeing */
-		to->is_copy = 1;
-	}
-}
-
-static void move_stack(bNodeStack *to, bNodeStack *from)
-{
-	if (to != from) {
-		copy_v4_v4(to->vec, from->vec);
-		to->data = from->data;
-		to->datatype = from->datatype;
-		to->is_copy = from->is_copy;
-
-		zero_v4(from->vec);
-		from->data = NULL;
-		from->datatype = 0;
-		from->is_copy = 0;
-	}
-}
-
-/**** GROUP ****/
-
-static void *group_initexec(bNode *node)
-{
-	bNodeTree *ngroup = (bNodeTree *)node->id;
-	bNodeTreeExec *exec;
-	bNodeSocket *sock;
-	bNodeStack *ns;
-
-	if (!ngroup)
-		return NULL;
-
-	/* initialize the internal node tree execution */
-	exec = ntreeCompositBeginExecTree(ngroup, 0);
-
-	/* tag group outputs as external to prevent freeing */
-	for (sock = ngroup->outputs.first; sock; sock = sock->next) {
-		if (!(sock->flag & SOCK_INTERNAL)) {
-			ns = node_get_socket_stack(exec->stack, sock);
-			ns->external = 1;
-		}
-	}
-
-	return exec;
-}
-
-static void group_freeexec(bNode *UNUSED(node), void *nodedata)
-{
-	bNodeTreeExec *gexec = (bNodeTreeExec *)nodedata;
-
-	if (gexec)
-		ntreeCompositEndExecTree(gexec, 0);
-}
-
-/* Copy inputs to the internal stack.
- * This is a shallow copy, no buffers are duplicated here!
- */
-static void group_copy_inputs(bNode *node, bNodeStack **in, bNodeStack *gstack)
-{
-	bNodeSocket *sock;
-	bNodeStack *ns;
-	int a;
-	for (sock=node->inputs.first, a=0; sock; sock=sock->next, ++a) {
-		if (sock->groupsock) {
-			ns = node_get_socket_stack(gstack, sock->groupsock);
-			copy_stack(ns, in[a]);
-		}
-	}
-}
-
-/* Copy internal results to the external outputs.
- */
-static void group_move_outputs(bNode *node, bNodeStack **out, bNodeStack *gstack)
-{
-	bNodeSocket *sock;
-	bNodeStack *ns;
-	int a;
-	for (sock = node->outputs.first, a = 0; sock; sock = sock->next, ++a) {
-		if (sock->groupsock) {
-			ns = node_get_socket_stack(gstack, sock->groupsock);
-			move_stack(out[a], ns);
-		}
-	}
-}
-
-/* Free internal buffers */
-static void group_free_internal(bNodeTreeExec *gexec)
-{
-	bNodeStack *ns;
-	int i;
-
-	for (i = 0, ns = gexec->stack; i < gexec->stacksize; ++i, ++ns) {
-		if (!ns->external && !ns->is_copy) {
-			if (ns->data) {
-				ns->data = NULL;
-			}
-		}
-	}
-}
-
-static void group_execute(void *data, int thread, struct bNode *node, void *nodedata, struct bNodeStack **in, struct bNodeStack **out)
-{
-	bNodeTreeExec *exec= (bNodeTreeExec *)nodedata;
-	
-	if (!exec)
-		return;
-	
-	/* XXX same behavior as trunk: all nodes inside group are executed.
-	 * it's stupid, but just makes it work. compo redesign will do this better.
-	 */
-	{
-		bNode *inode;
-		for (inode=exec->nodetree->nodes.first; inode; inode=inode->next)
-			inode->need_exec = 1;
-	}
-	
-	group_copy_inputs(node, in, exec->stack);
-	ntreeExecNodes(exec, data, thread);
-	group_free_internal(exec);
-	group_move_outputs(node, out, exec->stack);
-}
-
 void register_node_type_cmp_group(bNodeTreeType *ttype)
 {
 	static bNodeType ntype;
@@ -224,7 +51,7 @@ void register_node_type_cmp_group(bNodeTreeType *ttype)
 	node_type_template(&ntype, node_group_template);
 	node_type_update(&ntype, NULL, node_group_verify);
 	node_type_group_edit(&ntype, node_group_edit_get, node_group_edit_set, node_group_edit_clear);
-	node_type_exec_new(&ntype, group_initexec, group_freeexec, group_execute);
 
 	nodeRegisterType(ttype, &ntype);
 }
+
diff --git a/source/blender/nodes/intern/node_exec.c b/source/blender/nodes/intern/node_exec.c
index 86f8f4dfbbf..1889fd9a38e 100644
--- a/source/blender/nodes/intern/node_exec.c
+++ b/source/blender/nodes/intern/node_exec.c
@@ -258,7 +258,7 @@ void ntree_exec_end(bNodeTreeExec *exec)
 	MEM_freeN(exec);
 }
 
-/**** Compositor/Material/Texture trees ****/
+/**** Material/Texture trees ****/
 
 bNodeThreadStack *ntreeGetThreadStack(bNodeTreeExec *exec, int thread)
 {
@@ -287,32 +287,6 @@ void ntreeReleaseThreadStack(bNodeThreadStack *nts)
 	nts->used = 0;
 }
 
-void ntreeExecNodes(bNodeTreeExec *exec, void *callerdata, int thread)
-{
-	bNodeStack *nsin[MAX_SOCKET];	/* arbitrary... watch this */
-	bNodeStack *nsout[MAX_SOCKET];	/* arbitrary... watch this */
-	bNodeExec *nodeexec;
-	bNode *node;
-	int n;
-	
-	/* nodes are presorted, so exec is in order of list */
-	
-	for (n=0, nodeexec= exec->nodeexec; n < exec->totnodes; ++n, ++nodeexec) {
-		node = nodeexec->node;
-		if (node->need_exec) {
-			node_get_stack(node, exec->stack, nsin, nsout);
-			/* Handle muted nodes...
-			 * If the mute func is not set, assume the node should never be muted,
-			 * and hence execute it!
-			 */
-			if (node->typeinfo->execfunc)
-				node->typeinfo->execfunc(callerdata, node, nsin, nsout);
-			else if (node->typeinfo->newexecfunc)
-				node->typeinfo->newexecfunc(callerdata, thread, node, nodeexec->data, nsin, nsout);
-		}
-	}
-}
-
 void ntreeExecThreadNodes(bNodeTreeExec *exec, bNodeThreadStack *nts, void *callerdata, int thread)
 {
 	bNodeStack *nsin[MAX_SOCKET];	/* arbitrary... watch this */
diff --git a/source/blender/nodes/intern/node_exec.h b/source/blender/nodes/intern/node_exec.h
index e985795de71..92ab0813bb1 100644
--- a/source/blender/nodes/intern/node_exec.h
+++ b/source/blender/nodes/intern/node_exec.h
@@ -77,8 +77,6 @@ void node_get_stack(struct bNode *node, struct bNodeStack *stack, struct bNodeSt
 struct bNodeTreeExec *ntree_exec_begin(struct bNodeTree *ntree);
 void ntree_exec_end(struct bNodeTreeExec *exec);
 
-void ntreeExecNodes(struct bNodeTreeExec *exec, void *callerdata, int thread);
-
 struct bNodeThreadStack *ntreeGetThreadStack(struct bNodeTreeExec *exec, int thread);
 void ntreeReleaseThreadStack(struct bNodeThreadStack *nts);
 void ntreeExecThreadNodes(struct bNodeTreeExec *exec, struct bNodeThreadStack *nts, void *callerdata, int thread);