Index: binaries/data/mods/public/simulation/components/Builder.js
===================================================================
--- binaries/data/mods/public/simulation/components/Builder.js
+++ binaries/data/mods/public/simulation/components/Builder.js
@@ -47,11 +47,18 @@
 
 	let disabledTemplates = cmpPlayer.GetDisabledTemplates();
 
-	let cmpTemplateManager = Engine.QueryInterface(SYSTEM_ENTITY, IID_TemplateManager);
-
-	return entities.filter(ent => !disabledTemplates[ent] && cmpTemplateManager.TemplateExists(ent));
+	return entities.filter(ent => !disabledTemplates[ent] && CheckTemplateExists(ent));
 };
 
+Builder.prototype.templateExistsCache = {};
+
+function CheckTemplateExists(template)
+{
+	if (!(template in Builder.prototype.templateExistsCache))
+		Builder.prototype.templateExistsCache[template] = Engine.QueryInterface(SYSTEM_ENTITY, IID_TemplateManager).TemplateExists(template);
+	return Builder.prototype.templateExistsCache[template];
+}
+
 Builder.prototype.GetRange = function()
 {
 	let max = 2;