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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@allObjects
@Bernd, good to know... and sad at the same time.
Electrically on the digital side? - may be... but it could also be on the RF side, even though the layout may have followed the guidelines (Application Design Notes regarding RF).
The alternative you link to looked at first side great... and the ESP-12X modules are improved follow ups of the original ESP-01 modules. But the the placement of the module and the traces on the back of the shield put me at unease. Running with an external antenna would probably work well. These shields are obviously a lottery: https://claus.bloggt.es/2017/02/26/arduino-esp8266-wifi-shield-elecshop-ml-by-wangtongze-comparison/
Many others that use kind of RF modules - with onboard ceramic or pcb trace antenna - make sure that the shield has the least impact on the RF Transmission quality.