Secunderabad is not only the primary terminal of Hyderabad City but also it's chief re-routing junction. Almost every other major station in Hyderabad can be only directly re-routed from Secunderabad with MJF acting as the only bypass.
Almost all city major stations like Kacheguda, Nampally, Ligampally, Falaknuma are directly accessible courtesy SC, and it has a strong passenger patronage for each of this stations too...
Hence the delay is a bit inavoidable...