diff --git a/dummyflasher.c b/dummyflasher.c
index 89e8ba43e..6426ad2ed 100644
--- a/dummyflasher.c
+++ b/dummyflasher.c
@@ -54,6 +54,9 @@ struct emu_data {
 	unsigned int emu_chip_size;
 	int emu_modified;	/* is the image modified since reading it? */
 	uint8_t emu_status;
+	/* If "freq" parameter is passed in from command line, commands will delay
+	 * for this period before returning. */
+	unsigned long int delay_us;
 	unsigned int emu_max_byteprogram_size;
 	unsigned int emu_max_aai_size;
 	unsigned int emu_jedec_se_size;
@@ -175,6 +178,7 @@ int dummy_init(void)
 		return 1;
 	}
 	data->emu_chip = EMULATE_NONE;
+	data->delay_us = 0;
 	spi_master_dummyflasher.data = data;
 
 	msg_pspew("%s\n", __func__);
@@ -289,6 +293,52 @@ int dummy_init(void)
 	}
 	free(tmp);
 
+	/* frequency to emulate in Hz (default), KHz, or MHz */
+	tmp = extract_programmer_param("freq");
+	if (tmp) {
+		unsigned long int freq;
+		char *units = tmp;
+		char *end = tmp + strlen(tmp);
+
+		errno = 0;
+		freq = strtoul(tmp, &units, 0);
+		if (errno) {
+			msg_perr("Invalid frequency \"%s\", %s\n",
+					tmp, strerror(errno));
+			free(tmp);
+			return 1;
+		}
+
+		if ((units > tmp) && (units < end)) {
+			int units_valid = 0;
+
+			if (units < end - 3) {
+				;
+			} else if (units == end - 2) {
+				if (!strcasecmp(units, "hz"))
+					units_valid = 1;
+			} else if (units == end - 3) {
+				if (!strcasecmp(units, "khz")) {
+					freq *= 1000;
+					units_valid = 1;
+				} else if (!strcasecmp(units, "mhz")) {
+					freq *= 1000000;
+					units_valid = 1;
+				}
+			}
+
+			if (!units_valid) {
+				msg_perr("Invalid units: %s\n", units);
+				free(tmp);
+				return 1;
+			}
+		}
+
+		/* Assume we only work with bytes and transfer at 1 bit/Hz */
+		data->delay_us = (1000000 * 8) / freq;
+	}
+	free(tmp);
+
 #if EMULATE_CHIP
 #if EMULATE_SPI_CHIP
 	tmp = extract_programmer_param("size");
@@ -963,6 +1013,8 @@ static int dummy_spi_send_command(const struct flashctx *flash, unsigned int wri
 	for (i = 0; i < readcnt; i++)
 		msg_pspew(" 0x%02x", readarr[i]);
 	msg_pspew("\n");
+
+	programmer_delay((writecnt + readcnt) * emu_data->delay_us);
 	return 0;
 }