Looks like a burning bush.
If it was drift, the weigela next to it, the rose, etc would also be showing some damage.
Spider mites--although it usually doesn't look like that--can damage a burning bush, once again, assuming that's what it is.
Too much water?
Looks like it might be at the end of a porch, did someone dump some cleaning water near the bush?
Get a soil probe and check around the bush--too wet or too dry.
Keep us informed.
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