After ZBX-5201 in windows agent log we can see these new additional lines (or even more):
1180:20140512:185350.875 collect_perfstat() counterpath:'???????? ??????? ??????????' old first:0 second:0
1180:20140512:185350.890 collect_perfstat() counterpath:'???????? ??????? ??????????' new first:2 second:0
1180:20140512:185350.890 collect_perfstat() '???????? ??????? ??????????' calculated value:2.000000
1180:20140512:185350.890 collect_perfstat() counterpath:'?????????(1)% ????????????? ??????????' old first:288052656250 second:130443836298281250
1180:20140512:185350.890 collect_perfstat() counterpath:'?????????(1)% ????????????? ??????????' new first:288061875000 second:130443836308750000
1180:20140512:185350.890 collect_perfstat() '?????????(1)% ????????????? ??????????' calculated value:11.940299
1180:20140512:185350.890 collect_perfstat() counterpath:'?????????(0)% ????????????? ??????????' old first:290531093750 second:130443836298281250
1180:20140512:185350.906 collect_perfstat() counterpath:'?????????(0)% ????????????? ??????????' new first:290540000000 second:130443836308750000
1180:20140512:185350.906 collect_perfstat() '?????????(0)% ????????????? ??????????' calculated value:14.925373
1180:20140512:185350.906 collect_perfstat() counterpath:'?????????(_Total)% ????????????? ??????????' old first:289291875000 second:130443836298281250
1180:20140512:185350.906 collect_perfstat() counterpath:'?????????(_Total)% ????????????? ??????????' new first:289300937500 second:130443836308750000
1180:20140512:185350.906 collect_perfstat() '?????????(_Total)% ????????????? ??????????' calculated value:13.432836
1180:20140512:185350.906 End of collect_perfstat()

Before changes in ZBX-5201 only one line was logging:
2280:20140512:190039.000 In collect_perfstat()

We discussed in the past with dimir that no need anymore to log those lines, they were need for development troubleshooting.
Need to remove them now.

Probably is good to leave "End of collect_perfstat()" new line only, as you wish.