Just a quick tool to generate <n> random ASCII chars and print them to stdout.
git clone https://github.com/MoSal/rand-ascii.git
cargo build --release
Requires cargo (and rustc of course).
Check out rustup if you never built Rust code before.
Binary can be found at target/release/rand-ascii.
rand-ascii <n>
n is the number of random chars to be generated and printed. Values
accept g/m/k suffices, which correspond to GiB/MiB/KiB values.
rand-ascii 1g > /dev/null
Or if you want to trivially test the "performance" of some terminal emulators:
time rand-ascii 1g
Limiting printed output to ASCII (unlike let's say, cat /dev/urandom) may minimize
variation of results stemming from a variation in sophistication of the text stacks
utilized by each terminal.
Besides, call me paranoid, but I wouldn't feel fully confident running cat /dev/urandom
in terminal emulators implemented in unsafe languages.