Issues

CTS Slow Loading and Errors (CRITICAL)
#106139 CTTG CO2591 Customer says CT is unusable. "CTS taking a long time to load up and often resulting in time outs or "error retrieving data" messages." Reported multiple times over the past year and just continues to get worse. Both backed (Michael) and UI (Ben K) have evaluated. This is the outcome: - There are a limited number of concurrent connections any browser can open (8 is the average. Older browsers can be as low as 5, where browsers like Opera can be as high as 10). Each lookup is added to the browser queue and processed in order of "first returned". Any concurrent calls made beyond that max is queued and will show up as "(pending)". We try to mitigate this by utilising our own JS queue manager that limits calls by throttling to 5 concurrent connections and grouping requests that have the same URL+params. This significantly reduces calls to the server made by our UI while 'spreading the load'. Our servers also have a limited number of concurrent connections they can open. The default is 10 per IIS instance. If the server has maxed out, any further requests just sit there in a holding pattern until the server has an available connection. This will also show up in the browser as "(pending)". This is how we can see service / API responses taking less than a couple seconds, but it takes many minutes in some cases for the request to complete. Response time is very poor, but actual request time is fine. There is nothing we can do about this other than (a) reduce calls by reducing rows and columns, or (b) reduce calls by combining data into larger datasets, or (c) increase our instances for our load balancers.
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