Beacon listener

Question

I have beacon (ble_app_beacon) transmitting every 40...50 ms, nRFConnect shows adv interval is ~44 ms, so it receives ~22 msg/sec. My beacon listener gets only 10...12 msg/sec, below is (part) listener code. HW is nRF52832, SDK_15.1.0. 
 static void ble_evt_handler(ble_evt_t const * p_ble_evt, void * p_context)
{
 ble_gap_evt_t const * p_gap_evt = &p_ble_evt->evt.gap_evt;

 switch (p_ble_evt->header.evt_id)
 { 
 case BLE_GAP_EVT_ADV_REPORT:
 {
 rxCnt++;
 RED_TGL;	// toggle RED led
 }
 break;
 default:
 
 break;
 }
}


static void soc_evt_handler(uint32_t evt_id, void * p_context)
{
 scan_start();
}

static void ble_stack_init(void)
{
 ret_code_t err_code;
 err_code = nrf_sdh_enable_request();
 APP_ERROR_CHECK(err_code);
 // Configure the BLE stack using the default settings.
 // Fetch the start address of the application RAM.
 uint32_t ram_start = 0;
 err_code = nrf_sdh_ble_default_cfg_set(APP_BLE_CONN_CFG_TAG, &ram_start);
 APP_ERROR_CHECK(err_code);

 // Enable BLE stack.
 err_code = nrf_sdh_ble_enable(&ram_start);
 APP_ERROR_CHECK(err_code);

 // Register handlers for BLE and SoC events.
 NRF_SDH_BLE_OBSERVER(m_ble_observer, APP_BLE_OBSERVER_PRIO, ble_evt_handler, NULL);
}

static void scan_evt_handler(scan_evt_t const * p_scan_evt)
{
 switch(p_scan_evt->scan_evt_id)
 {
 case NRF_BLE_SCAN_EVT_SCAN_TIMEOUT:
 {
 BLUE_TGL;	// toggle blue led
 scan_start();
 } break;

 default:
 break;
 }
}



static void scan_init(void)
{
 ble_uuid_t target_uuid = 
 {
 .uuid = BLE_UUID_TX_POWER_SERVICE, //BLE_UUID_HEART_RATE_SERVICE,
 .type = BLE_UUID_TYPE_VENDOR_BEGIN //BLE_UUID_TYPE_BLE
 };
 ret_code_t err_code;
 nrf_ble_scan_init_t init_scan;

 memset(&init_scan, 0, sizeof(init_scan));

 init_scan.connect_if_match = false; //true;
 init_scan.conn_cfg_tag = APP_BLE_CONN_CFG_TAG;

 err_code = nrf_ble_scan_init(&m_scan, &init_scan, scan_evt_handler);
 APP_ERROR_CHECK(err_code);
 
}

static void scan_start(void)
{
 ret_code_t err_code;
 err_code = nrf_ble_scan_start(&m_scan);
 APP_ERROR_CHECK(err_code);
}