Set job concurrency to reduce performance issue

src/queue/processors/object-storage/index.ts

@@ -7,6 +7,6 @@ const jobs = {
 
 export default function(q: Bull.Queue) {
 	for (const [k, v] of Object.entries(jobs)) {
-		q.process(k, v as any);
+		q.process(k, 16, v as any);
 	}
 }