top 8 entry from grpof of my app :-(

[%u]

same figure demangled.

===========================================================
Each sample counts as 0.01 seconds.
  %   cumulative   self              self     total
 time   seconds   seconds    calls   s/call   s/call  name
 38.84    657.63   657.63                             MFPvZPS3gcx4Pool
gcx.Gcx.findPool
 24.43   1071.29   413.66                             MFPvPvZv gcx.Gcx.mark
  9.52   1232.48   161.19                             MFPvZk gcx.Gcx.fullcollect
  6.71   1346.01   113.53                             MFkZk gcbits.GCBits.test
  5.87   1445.33    99.32                             MFkZk gcx.Pool.allocPages
  3.64   1507.03    61.70                             void
invariant._d_invariant(class Object)
  3.21   1561.38    54.35                             MFkZv gcbits.GCBits.set
  0.98   1578.03    16.65                             void* gcx.sentinel_add(void*)