@simon @slightlyoff It is not just javascript. In spite of a high-bandwidth connection, I've been getting very bad response loading web pages recently. After diagnosing the problem, I found that there was 76% to 91% packet loss on DNS requests to the servers my ISP configures! I'm about to file a service request, but in the meantime, I changed DNS servers to publicly available ones.

What made it worse was the number of DNS requests now needed to load a web page.