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  VS Arduino › Visual Micro › Usb/Serial/WiFi Debugging › [Bug Report]Serial Monitor timestamps randomly missing during fast/continuous serial output
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Long Trinh
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[Bug Report]Serial Monitor timestamps randomly missing during fast/continuous serial output
Aug 21st, 2026 at 1:05pm
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Problem Description
When transmitting high-frequency continuous data over the serial port, line timestamps in the Visual Micro Serial Monitor window are randomly  missing.

This issue does not occur when monitoring the exact same serial stream in other tools (such as Arduino IDE Serial Monitor or Hercules Terminal), where all timestamps render consistently. This suggests the issue is related to the timestamp handling/rendering buffer within the Visual Micro Serial Monitor under continuous load. (I previously noted this behavior in 2024, and it persists in the current release.)

Steps to Reproduce
- Flash a sketch that prints rapidly and continuously to Serial (e.g., in a fast void loop() without delay).
- Enable timestamps in the Visual Micro Serial Monitor.
- Observe the output: timestamps intermittently stop appearing on output lines during high throughput.

Environment & Setup
- Visual Micro Version: 2026.708.2204
- Visual Studio Version: Visual Studio 2026 Community (v18.9.1)
- Arduino IDE Version (for reference): 2.3.10
- PC1: Intel Core i5 8th Gen, 16 GB DDR4, 1TB NVME SSD, Windows 11 Pro 25H2 (Latest build 26200.9168)
- PC2: Intel Core i7 3rd Gen, 16 GB DDR3, 1TB SATA SSD, Windows 10 Pro 22H2 (Latest build 19045.7663)

Target Board Configuration
Board: ESP32S3 Dev Module (esp32_esp32s3)
Upload Speed: 921600 
USB Mode: Hardware CDC and JTAG
USB CDC On Boot: Enabled
USB Firmware MSC On Boot: Disabled
USB DFU On Boot: Disabled
Upload Mode: UART0 / Hardware CDC
CPU Frequency: 240MHz (WiFi)
Flash Mode: QIO 80MHz 
Flash Size: 16MB (128Mb)
Core Debug Level: Error
PSRAM: Disabled
Arduino Runs On: Core 1
Events Runs On: Core 1
JTAG Adapter: Disabled
Zigbee Mode: Disabled

I've attached the bug screenshot and the build properties output log, could you please investigate the Serial Monitor timestamp rendering logic during high-throughput serial output? Let me know if you need any additional diagnostic logs or a minimal test sketch to reproduce it.
« Last Edit: Aug 21st, 2026 at 1:15pm by Long Trinh »  
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Simon@Visual Micro
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Re: [Bug Report]Serial Monitor timestamps randomly missing during fast/continuous serial output
Reply #1 - Aug 21st, 2026 at 2:01pm
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Thanks for the report, we will be releasing a fix to this shortly, and will update when it is available.
  
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Re: [Bug Report]Serial Monitor timestamps randomly missing during fast/continuous serial output
Reply #2 - Aug 21st, 2026 at 3:39pm
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Please update to the latest version (26.0708.05) which can be downloaded to the top of the board below:-
https://www.visualmicro.com/forums/YaBB.pl?board=VS_ARDUINO_EXT_RELEASES

Let us know if you have any further issues, and thankyou for your detailed report.
  
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Long Trinh
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Re: [Bug Report]Serial Monitor timestamps randomly missing during fast/continuous serial output
Reply #3 - Aug 21st, 2026 at 3:58pm
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Simon@Visual Micro wrote on Aug 21st, 2026 at 3:39pm:
Please update to the latest version (26.0708.05) which can be downloaded to the top of the board below:-
https://www.visualmicro.com/forums/YaBB.pl?board=VS_ARDUINO_EXT_RELEASES

Let us know if you have any further issues, and thankyou for your detailed report.


Thank you for your quickly support! Please publish this release to the Visual Studio Extension marketplace so that we can do the update directly in Visual Studio. I will check and report to you if the issue is fully solved.
  
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