diff --git a/app/vmselect/netstorage/netstorage.go b/app/vmselect/netstorage/netstorage.go
index b3a7a5aad..ed43a12e3 100644
--- a/app/vmselect/netstorage/netstorage.go
+++ b/app/vmselect/netstorage/netstorage.go
@@ -467,7 +467,7 @@ func (pts *packedTimeseries) unpackTo(dst []*sortBlock, tbf *tmpBlocksFile, tr s
 		upw.br = br
 		upw.tr = tr
 	}
-	if gomaxprocs == 1 || upwsLen <= 100 {
+	if gomaxprocs == 1 || upwsLen <= 1000 {
 		// It is faster to unpack all the data in the current goroutine.
 		upw := getUnpackWork()
 		samples := 0
diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 2c2d670ef..facb33e5b 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -17,6 +17,7 @@ The following tip changes can be tested by building VictoriaMetrics components f
 
 * FEATURE: [vmui](https://docs.victoriametrics.com/#vmui): add ability to show custom dashboards at vmui by specifying a path to a directory with dashboard config files via `-vmui.customDashboardsPath` command-line flag. See [this feature request](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3322) and [these docs](https://github.com/VictoriaMetrics/VictoriaMetrics/tree/master/app/vmui/packages/vmui/public/dashboards).
 
+* BUGFIX: reduce the increased CPU usage at `vmselect` to v1.85.3 level when processing heavy queries. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3641).
 * BUGFIX: [vmagent](https://docs.victoriametrics.com/vmagent.html): [dockerswarm_sd_configs](https://docs.victoriametrics.com/sd_configs.html#dockerswarm_sd_configs): apply `filters` only to objects of the specified `role`. Previously filters were applied to all the objects, which could cause errors when different types of objects were used with filters that were not compatible with them. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3579).
 * BUGFIX: [vmagent](https://docs.victoriametrics.com/vmagent.html): suppress all the scrape errors when `-promscrape.suppressScrapeErrors` is enabled. Previously some scrape errors were logged even if `-promscrape.suppressScrapeErrors` flag was set.
 * BUGFIX: [vmagent](https://docs.victoriametrics.com/vmagent.html): consistently put the scrape url with scrape target labels to all error logs for failed scrapes. Previously some failed scrapes were logged without this information.