Thanks waaren for this helpful inputs.

I reduce the maxItem to 20 (that was an old idea I no more use). That has reduced the running time. Now the script uses about 4 seconds. Most time consumation is in the initial part of script. It use near 4 seconds from start message to the first code (line 31 ...

Thanks Warren for your Help

Below is the code. Sorry for mixed language and not perfect scripting structure. I removed outcommented code for debugging and personal information.

return {
on = {
timer = { 'every minute' },
httpResponses = { 'energyRetrievedSolarWatt' }
},
data = {
PowerIn ...

Hello

I updated my Raspi to Buster and istalled the newes version of Domoticz. Now I have a notification or an error in the protocol log:

2020-05-31 10:43:15.439 Error: dzVents: Error: (3.0.2) ------ Finished SolarWatt after >9 seconds. (using 8.552 seconds CPU time !)
2020-05-31 10:44:05.665 ...