因为电脑处理速度的缓慢，我不得不等待更长时间来完成工作。

Due to the ___slowness of my computer, I had to wait longer to finish my work.

她对指令的理解迟钝导致工作进度落后了。

Her ___slowness in understanding instructions caused the work to fall behind schedule.

由于网速太慢，下载文件花了我很长时间。

The ___slowness of the internet connection made the file download take forever.