What might the bottlenecks be?

瓶颈有哪些？

Which ones are bottlenecks?

哪些是瓶颈？

Disk (storage) bottlenecks.

磁盘(存储)瓶颈。

Where are the bottlenecks?

瓶颈在哪里？

Some processes contain bottlenecks.

有些流程包含一些瓶颈。