Here are a few test calculations: (Sharp) EL-W516 vs. (Casio) fx115-ES vs. (TI) 36X-Pro. All three calculators are set to "pretty print" mode.

#1:
1200+3800+28700+2899+19000+2839+4657+2983-2930-10000 = 53148

I notice a little slowness in the 115ES towards the end, but not in the 36X-Pro. The EL-W516 works fine.

#2:

sqrt(7^2 + 7^3 + 8^2 + 8^3 + 9^2 + 9^3 + 10^2 + 10^3 + 11^2 + 11^3) = 65.80273551
[using the y^x key]

All three calculators work fine.

#3:
1 2
1 + --------- * --------------
1 2
1 + ---------- 2 + ------------
1 2
1 + ---------- 2 + -----------
1 2
1 + ------- 2 + ------
2 3

= 35/24

= 1 + 1 / (1 + 1 / (1 + 1 /( 1 + 1 / 2 ))) *
2 / (2 + 2 /( 2 + 2 /( 2 + 2 / 3 )))

The fx-115ES returns the answer and works fine, and so does the EL-W516.

The 36X-Pro returns "MEMORY LIMIT" Error when using the fraction key, but expression works when using the division key and parenthesis.

# 4:
pi^2.4 - pi^pi + e^(2^3.1)
pi * ----------------------------- - 1.4 ln(5)
e^2.4 - e^e^1 + pi^(2^3.1)

= -1.348316376

fx-115ES: Calculator returns Syntax error (at pi^(2^3.1)). The calculator doesn't take every key stroke once I get to the last term

36X-Pro: calculation has to really "refresh" itself as I am finishing the denominator

EL-W516: This calculator wins with this example. Entry was responsive without slow down the entire calculation

# 5:

Integrate 3x^3 - x^2 + 1/x - 1/(x^2) + 1 from 1 to 10

= 7176.652585

The fx-115ES works fine. I can enter the integral on the 36X-Pro fine, but took several seconds for the integral to calculate. The EL-W516 operates similarly to the 36X-Pro.

# 6:

Sum of sin(tan(x)) + tan(sin(x)) - cos(x) - cos(x)^2 from 1 to 10 - Radians Mode

= -0.2223937769

fx-115ES: entry is fine, but the calculator took a few seconds to find the sum

36X-Pro: entry is fine and the sum was instantly found

EL-W516: entry is fine but the calculator took a few seconds to find the sum

# 7:

sqrt(3^6 - 2^3 + 1) 2.7^2.5 - 1.7^2.5
-------------------- + sqrt( --------------------- )
2 * cuberoot(4) 1.7^2.5 - cuberoot(6)

= 10.51498832

fx-115ES: the entry really slows down when I am entering the second term

36X-Pro: The calculator flashes with each keystroke at the second term, but very little speed slow down

EL-W516: This calculator handled the expression well - no slow down

Overall:

I think the EL-W516 wins with these super long expressions.