computer: stateful: perf improvements

crates/brk_core/src/structs/addressdata.rs

@@ -18,7 +18,7 @@ impl AddressData {
     }
 
     pub fn realized_price(&self) -> Dollars {
-        (self.realized_cap / Bitcoin::from(self.amount())).round_nearest_cent()
+        (self.realized_cap / Bitcoin::from(self.amount())).round_to_4_digits()
     }
 
     #[inline(always)]

crates/brk_core/src/structs/cents.rs

@@ -24,10 +24,28 @@ use super::Dollars;
 )]
 pub struct Cents(i64);
 
+const SIGNIFICANT_DIGITS: i32 = 4;
+
 impl Cents {
     pub const fn mint(value: i64) -> Self {
         Self(value)
     }
+
+    pub fn round_to_4_digits(self) -> Self {
+        let v = self.0;
+
+        let ilog10 = v.checked_ilog10().unwrap_or(0) as i32;
+
+        Self::from(if ilog10 >= SIGNIFICANT_DIGITS {
+            let log_diff = ilog10 - SIGNIFICANT_DIGITS + 1;
+
+            let pow = 10.0_f64.powi(log_diff);
+
+            ((v as f64 / pow).round() * pow) as i64
+        } else {
+            v
+        })
+    }
 }
 
 impl From<Dollars> for Cents {

crates/brk_core/src/structs/dollars.rs

@@ -42,6 +42,10 @@ impl Dollars {
     pub fn round_nearest_cent(self) -> Self {
         Dollars((self.0 * 100.0).round() / 100.0)
     }
+
+    pub fn round_to_4_digits(self) -> Self {
+        Self::from(Cents::from(self).round_to_4_digits())
+    }
 }
 
 impl From<f32> for Dollars {