When using redstone, explosions, mining, building, there is a calculation delay. When i set off the TNT, it takes up to 5-15 seconds after the "boom" sound, for the terrain to be affected. Redstone doesn't calculate as fast as it used to. 2 repeaters with redstone (Redstone Clock), is much slower.
Blocks don't break imminently after breaking them with a tool/fist.
Seems like calculation speed has been sacrificed for FPS.

1. Put down TNT
2. Detonate TNT
3. Watch the TNT disappear
4. Wait an eternity for the terrain to change.

Here's a link to a video on the issue: https://www.youtube.com/watch?v=424cNO1nyEI&feature=youtu.be