Dynamic resource, on the other hand, will create a temporary expression during the initial compilation and thus defer lookup for resources until the requested resource value is actually required in order to construct an object. Lookup behavior for that resource is analogous to run-time lookup, which imposes a performance impact. Use static resources whenever possible in your application, using dynamic resources only when necessary.
The demerit of DynamicResource is that it reduces application performance because resources are retrieved every time they are used. The best practice is to StaticResource use until there is a specific reason to use DynamicResource.
标签：resource,drawbacks,dynamic,application,lookup,WPF,resources From： https://www.cnblogs.com/Fred1987/p/18183797