e2e: reduce load volume (#6932)

test/e2e/runner/load.go

@@ -78,8 +78,8 @@ func Load(ctx context.Context, testnet *e2e.Testnet) error {
 //
 // The chTx has multiple consumers, thus the rate limiting of the load
 // generation is primarily the result of backpressure from the
-// broadcast transaction, though at most one transaction will be
-// produced every 10ms.
+// broadcast transaction, though there is still some timer-based
+// limiting.
 func loadGenerate(ctx context.Context, chTx chan<- types.Tx, size int64) {
 	timer := time.NewTimer(0)
 	defer timer.Stop()
@@ -109,7 +109,7 @@ func loadGenerate(ctx context.Context, chTx chan<- types.Tx, size int64) {
 		case chTx <- tx:
 			// sleep for a bit before sending the
 			// next transaction.
-			waitTime := (10 * time.Millisecond) + time.Duration(rand.Int63n(int64(500*time.Millisecond))) // nolint: gosec
+			waitTime := (25 * time.Millisecond) + time.Duration(rand.Int63n(int64(750*time.Millisecond))) // nolint: gosec
 			timer.Reset(waitTime)
 		}