Why am I CRAWLING to my cruise altitude? (screenshot attached)

I was going to mention this as well... is there a fix to this? It can get pretty frustrating when it's +40C outside at 30,000 feet and you can't get up to FL350 because of it.

I understand that this problem occurs above FL240 and is caused by a known issue between FSInn's weather engine and the Simconnect interface. Judging from what I have found online about it, there is no fix as such so a workaround is needed. One way around this is to NOT use FSInn's weather engine if your cruise altitude exceeds FL240 but, as others have already suggested, use a program such as AS2012 instead. As an aside, I often fly the PMDG B1900D on domestic routes and since this aircraft doesn't exceed FL240 I can use the FSInn weather engine no problem. Hope this helps.