@aasaf @mehdiattari @soheilhs
I did not say 100% it delays your application, but it might delay, might not. You never know.
So, how the system works is that when you apply your docs will be entered to Global Case Management System (GCMS). When you order ATI (Access to Information), they will print all your records in GCMS and send it to you. However, since there are a lot of information that needs to be redacted, one separate officer will take a look at the notes and decides which part to release and which part to redact. This is why usually it takes more than a month to release them. This officer might need to double check some details with the main officer who is working on your file. This can be a good thing or a bad thing. Suppose there was a glitch in the system, or the person uploaded a file and they forgot to consider it, or they just forgot about this case, then ordering notes will remind the officer to work on them. That is why there are some cases on these forums who claim that ordering notes helped their cases moving. On the other hand, sometimes when the officer sees that the person ordered notes and others try to verify which part to show and which part to redact, he/she stops adding new stuff until the process of notes is done. This might cause some delays on your application. However, there are cases that lies somewhere for months without any touch. In these cases, ordering notes does not delay anything as they are not working on the file anyways.
There are also other governmental agencies that do some part of your application. So, even though CIC once tweeted that GCMS does not delay the application, other agencies might delay it. I am also sure different groups and bureaus have their internal procedures of how to handle the notes.
TL;DR it depends on you. If you want to take the risk go ahead and order it, if you don't want don't do it. I myself did order it and am waiting for it.
If you have more details, please share with me