Adjust initial coordinator delay

src/core.go

@@ -7,7 +7,8 @@ import (
 	"time"
 )
 
-const COORDINATOR_DELAY time.Duration = 100 * time.Millisecond
+const COORDINATOR_DELAY_MAX time.Duration = 100 * time.Millisecond
+const COORDINATOR_DELAY_STEP time.Duration = 10 * time.Millisecond
 
 func initProcs() {
 	runtime.GOMAXPROCS(runtime.NumCPU())
@@ -151,8 +152,11 @@ func Run(options *Options) {
 				}
 			}
 		})
-		if ticks > 3 && delay && reading {
-			time.Sleep(COORDINATOR_DELAY)
+		if delay && reading {
+			dur := DurWithin(
+				time.Duration(ticks)*COORDINATOR_DELAY_STEP,
+				0, COORDINATOR_DELAY_MAX)
+			time.Sleep(dur)
 		}
 	}
 }

src/util.go

@@ -1,5 +1,7 @@
 package fzf
 
+import "time"
+
 func Max(first int, items ...int) int {
 	max := first
 	for _, item := range items {
@@ -19,3 +21,14 @@ func Min(first int, items ...int) int {
 	}
 	return min
 }
+
+func DurWithin(
+	val time.Duration, min time.Duration, max time.Duration) time.Duration {
+	if val < min {
+		return min
+	}
+	if val > max {
+		return max
+	}
+	return val
+}