- if (!defined $self->{__base_factor}) {
- $self->{__base_factor} = !$self->base_unit || !$self->factor || ($self->name eq $self->base_unit) ? 1 : $self->factor * $self->base->base_factor;
+ my $cache = $::request->cache('base_factor');
+
+ if (!defined $cache->{$self->id}) {
+ $cache->{$self->id} = !$self->base_unit || !$self->factor || ($self->name eq $self->base_unit) ? 1 : $self->factor * $self->base->base_factor;