I am fully aware of the amount of work developers do and never expect more than 50% of their time to be spent in full focus. But this amounts to around 20h per week.
The kind of behavior you describe amounts to me as medium-low performance, but as some other people mentions; there are other types of behaviors that are much more problematic because they disrupt the proper functioning of teams.
If you have low performance, but are not problematic and have other qualities that are positive; you won't be last in the list when thinking about salary raises nor first in the list when redundancies are needed. The other more problematic types will be instead.