This value reports how many dirty pages are queued for write-back, as captured in the general System statistics group. A persistently high value here, viewed alongside the free-page count in the same group, tells the admin write-back is lagging while free memory is also under pressure, a combination that can degrade responsiveness. For example, if this count climbs steadily during a heavy database update while free-page count also falls, the admin should consider tuning the modified-page writer or adding memory.