New IRCTC Guidelines suggested a fix timing for each step of form filling. In view of this what i suggest is :
1) Prepare a master list in Profile menu with details of Gender and DOB at least for self filling of age column of reservation form and meal preference only if you regularly eat in train.
2) Get at least one person ADHAAR authenticated as a senior citizen for lower birth and concessional preference.
3) If no senior citizen then at least details of one persons's PAN card or such ID should be filled up.
4) If you can afford or already have a credit card then apply for IRCTC Credit Card as now your payment channel is fixed (there is 10% discount too for travelling in 2AC for these card holders, and details are with them already otherwise you may opt for preferred payment method.
This will greatly reduce your time as well as load on IRCTC's network, specially during opening of Tatkaal windows and Railways is trying to give better facility to Bonafide Users or travellers so become one!
Wishing you all a very happy journey.