Some thoughs on this issue.
Yes, the I-Pace is not a charging speed champion but in my experience I had no problem in getting an average speed of 90kw in summer at any HPC station (MY21 and battery above 25C).
In winter is worse of course but it's the same for any EV (Tesla being an exception because of its ability to pre heat the battery) and it can affect the 1st charge of a trip. In my experience the following ones are at summer speed since the 1st charge heats up the battery quite a lot and, unless you're in very cold climate, the battery will hold pretty much the temperature.
I got back fom the Alps a week ago, the intial part of the trip at -10C then gradually warming up to 2C. First charge begun at 30kw but ended at 60kw (and 45C on the battery). The following 2 charges were at 110 - 50kw in the soc range of 10-80%.
As I already posted, I learned that HVAC will heat up the pattery only if the car has been switched off, it's not enough to turn off the climate while charging.
Then call me crazy, but I set ABRP to get with 7% of SOC at the charger if I'm poining to a multi stall charging (with realtime occupation info from ABRP) station and/or if there is a 11/22kw AC charging point nearby. The probablity that all of them will be off are really low and begin a charging session below 10% will help a lot the charging speed.