Performance in Full HD is not working well - request for improvements

Hi, I'm using Premiere version 25.6.4. It would be very helpful if you improved the program in this aspect and also in exporting to make it faster, as is already the case in other video editors. Also, at the production company where I work, all new workstations on AM5 with RTX 5070s have very poor export performance, whether normal or downscaling. Here in Brazil, there's a popular saying: "You made the child, now you have to raise it." I bought the RTX 5060 Ti to replace the RTX 3060, and I bitterly regret it. Since I bought it, I'll continue using it as is, as it cost me a considerable amount. To paraphrase the saying, "The child is yours, deal with the problem." I hope there will be some correction for the Nvidia RTX 5000 series.

Yes, Neil was filmed in 4K, but the final export had to be in full HD. It was filmed in MP4 using Canon's 4K codec at a bitrate of 150 Mbps, but the final export was in full HD at 25 Mbps. The sequence on the timeline was all in 4K because I let Premiere interpret the format; when importing the first take, it automatically creates the sequence in 4K in the format it was recorded in the camera. I don't know if the issue of a higher bitrate compared to a lower one limited performance; I found it quite strange, considering that 4K files with a higher bitrate are larger. The Canon XA 50 camera's 4K resolution is natively 150 Mbps; there is no option to select a lower bitrate.