To potentially improve performance, review your endpoint calls to check for code that invokes the same endpoint multiple times and consider using a bulk version for that given endpoint.
For example, you can make one call with a comma-separated list of product ids:
/ccstore/v1/products?productIds=Product_19Cxy,Product_15CD
Instead of making individual calls:
/ccstore/v1/products?productIds=Product_19Cxy /ccstore/v1/products?productIds=Product_15CD
For more information, see REST API query parameters.