Why is the impeachment proccess of Dilma Rousseff advancing so fast, while the proccess of other corrupt proimpeachment politicians take so much time?

PS: Post originalmente publicado no Quora

In few words, there’s a hidden agenda setting process.

Albeit Mr. Lynx Kepler is right pointing out the differences between Federal Judicial and Legislative Branches, I must argue that both of them are overcrowded and are rather unefficient. In addition, both branches have hidden (and unhidden) ways to set its own agenda, including accelerate or veto an oncoming impeachment.

STF had appreciated the constitutionality of current impeachment procedure in a fast pace (almost four months) in the ADPF 378. Counterwise, there's a pending lawsuit concerning the adoption of parliamentary system through an Ammendment of Constitution since 1997 (MS 22972)