How fast is the Bluetooth sync?

Kind of depends how long your activities are, what CIQ stuff you are using that might write to the FIT file, what external sensors you are using that might also write to the FIT file and whether using Smart or Every Second recording. If I have been outside for an hour or more then it might well take a few minutes to download an activity to the app. 10 mins does seem quite long however.

It seems to me that the last 40% relates to actually sending the data to web Connect. That's where I would look first.

Any idea how I could accelerate this?

If you don't need the extra data then you could use fewer sensors, but that defeats the point of the using the watch.

Bluetooth can take what seems like hours for long activities. A faster alternative might be to not use Bluetooth at all and set up a WiFi hotspot on your phone and sync with WiFi for longer activities. You could set WiFi transfer as a hot key on the START button for example.

Thanks for the answers guys.

I may not have been very clear though. The upload of activities is relatively fast and usually happens over WiFi as I am either at home or at work.
I barely use any CIQ field (just a Stryd power meter) but that is not the issue

What is rather annoying me is when I want to synchronise my watch during the day (I use it as an activity tracker), for instance when willing to download a workout.
This gets really really annoying and most of the time, I end up going out without the workout on my watch...
I will try to disable the segments.
Any other idea?

Cheers

I often find a power cycle of phone and 935 can help to restore "good" BLE connectivity. Sending a workout to the watch is hardly a massive file so sounds more like there is some connection issue than a massive queue of stuff.

I guess there is also the "answer" of getting setup with today's workout when you are at home. Personally I hardly ever use workouts so not usually encounter this problem but I have successfully added say a few Strava segments "in the field" before doing a run.

I often find a power cycle of phone and 935 can help to restore "good" BLE connectivity. Sending a workout to the watch is hardly a massive file so sounds more like there is some connection issue than a massive queue of stuff.

To add to this, you could also update the BT connection via the Connect app (Long press the watch in DEVICES and then UPDATE CONNECTION). It's a forced BT toggle and generally makes the BT sync quicker, until you will advently stray too far away from your phone and lose the connection which, when it reestablishes, will be weak and make updates go slower.

At least that's how it seems to workout on my end. Still i'd rather have a weak signal than no signal.

To add to this, you could also update the BT connection via the Connect app (Long press the watch in DEVICES and then UPDATE CONNECTION).

Not seen that before. Does not seem to work for me however. I am on iOS. Is this Android only perhaps?

Thank lindajm22 didn't know it was a android only feature. I use it from time to time though, I also find just manually turning on/off the BT connection from the watch fixes disconnects/slow BT signals most of the time.

The answer is...it depends. It depends on the strength of the phone's internet connection. When my phone is connected by wifi to the internet, it's fast. When sat in the pub last night with a single-bar 3G/4G connection it was painfully slow, needing several attempts before the activity was uploaded.