Mix graham cracker crumbs, sugar, and melted butter until like wet sand.
Press firmly into bottom of 9-inch springform pan.
Freeze crust while making filling.
Cook raspberries, sugar, and lemon juice over medium heat 5 minutes until broken down.
Mix cornstarch and water. Add to raspberries.
Cook 1 to 2 minutes until thickened.
Strain through fine mesh strainer to remove seeds.
Cool raspberry sauce completely.
Beat cream cheese 2 to 3 minutes until smooth.
Add powdered sugar, vanilla, lemon juice, and salt. Beat until combined.
In separate bowl, beat cold cream until stiff peaks form (3 to 4 minutes).
Gently fold whipped cream into cream cheese mixture. Mix just until no streaks.
Remove crust from freezer. Pour half of filling into crust.
Drizzle half of raspberry sauce in lines over filling.
Pour remaining filling on top.
Drizzle remaining sauce in lines.
Swirl with knife in figure-eight motions. Do not overmix.
Cover. Freeze at least 6 hours or overnight.
Remove 10 to 15 minutes before serving.
Run knife around edge. Release springform.
Slice with sharp knife. Wipe clean between cuts.
Top with fresh raspberries, whipped cream, and mint. Serve immediately.