Hi Sundaresh, SAS Viya is certainly set up for asynchronous processing. Your question specifically addresses client-side calls from Python. How you would make calls to the CAS would depend on your Python code or application. I found this article on aync communication with Python: https://www.aeracode.org/2018/02/19/python-async-simplified/. I would assume that the same kind of functionality would be available for R. In both cases, requests could be sent to SAS Viya for the heavy processing and your application/program could continue to run in the meantime. You may want to refer to my colleague Deva Kumar’s paper on restAF from the 2018 SAS Global Forum: https://www.sas.com/content/dam/SAS/support/en/sas-global-forum-proceedings/2018/1882-2018.pdf. Deva discusses how to use the JavaScript library that is specifically crafted to make API calls.