add concurrency

app.py

@@ -79,7 +79,7 @@ def group_collection_items(collection_slug: str):
     items = collection.items
     return groupby(get_collection_type, items)
 
-@cached(cache=TTLCache(maxsize=1000, ttl=CACHE_TIME))
+@cached(cache=TTLCache(maxsize=500, ttl=CACHE_TIME))
 def get_papers_for_collection(collection_slug: str):
     dataset_to_arxiv_id = create_dataset_to_arxiv_id_dict()
     models_to_arxiv_id = create_model_to_arxiv_id_dict()
@@ -155,4 +155,4 @@ gr.Interface(
     description=description,
     examples=examples,
     cache_examples=True,
-).launch()
+).queue(concurrency_count=4).launch()